BTRFS bad tree block start

Hi.

My Server is.
Hp Elitebook 2570p laptop
Rockstor 3.9.1-0 installed on a 64gb Sandisk usb stick
Disk Seagate 2tb 2.5" running 1113 hours connected via usb3.1 to sata III

Three times now, within 3 months, I have had a BTRFS pool crash, with my Seagate 2.5" 2tb disk.

[root@cmj-rockstor ~]# dmesg | grep sda
[ 3.760335] sd 7:0:0:0: [sda] 3907029168 512-byte logical blocks: (2.00 TB/1.82 TiB)
[ 3.760339] sd 7:0:0:0: [sda] 4096-byte physical blocks
[ 3.760463] sd 7:0:0:0: [sda] Write Protect is off
[ 3.760467] sd 7:0:0:0: [sda] Mode Sense: 43 00 00 00
[ 3.761278] sd 7:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn’t support DPO or FUA
[ 3.767003] sd 7:0:0:0: [sda] Attached SCSI disk
[ 30.116100] BTRFS: device label USB-Pool devid 1 transid 1250 /dev/sda
[ 32.722414] BTRFS info (device sda): use no compression
[ 32.722417] BTRFS info (device sda): disk space caching is enabled
[ 32.722418] BTRFS info (device sda): has skinny extents
[ 33.485720] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 33.497470] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 33.497602] BTRFS error (device sda): error loading props for ino 27459 (root 258): -5
[ 33.505416] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 33.506087] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 33.506296] BTRFS error (device sda): Error removing orphan entry, stopping orphan cleanup
[ 33.506407] BTRFS error (device sda): could not do orphan cleanup -22
[ 376.787887] BTRFS error (device sda): bad tree block start 7281 998473728
[ 376.799649] BTRFS error (device sda): bad tree block start 7281 998473728
[ 376.800355] BTRFS error (device sda): bad tree block start 7281 998473728
[ 376.817263] BTRFS error (device sda): bad tree block start 7281 998473728
[ 376.817870] BTRFS error (device sda): bad tree block start 7281 998473728
[ 376.818285] BTRFS error (device sda): bad tree block start 7281 998473728
[ 376.818865] BTRFS error (device sda): bad tree block start 7281 998473728
[ 376.819218] BTRFS error (device sda): bad tree block start 7281 998473728
[ 376.819830] BTRFS error (device sda): bad tree block start 7281 998473728
[ 376.820124] BTRFS error (device sda): bad tree block start 7281 998473728
[ 384.158535] BTRFS error (device sda): bad tree block start 18691697672960 1004421120
[ 384.289225] BTRFS error (device sda): bad tree block start 18691697672960 1004421120
[ 384.324632] BTRFS error (device sda): bad tree block start 7281 998473728
[ 384.326840] BTRFS error (device sda): bad tree block start 7281 998473728
[ 384.335001] BTRFS error (device sda): bad tree block start 7281 998473728
[ 384.337174] BTRFS error (device sda): bad tree block start 7281 998473728
[ 385.268597] BTRFS error (device sda): bad tree block start 18691697672960 1004421120
[ 385.499914] BTRFS error (device sda): bad tree block start 18691697672960 1004421120
[ 385.534828] BTRFS error (device sda): bad tree block start 8316303979042573056 998653952
[ 385.537004] BTRFS error (device sda): bad tree block start 8316303979042573056 998653952
[ 389.166863] BTRFS error (device sda): bad tree block start 18691697672960 1004421120
[ 389.204841] BTRFS error (device sda): bad tree block start 18691697672960 1004421120
[ 389.242973] BTRFS error (device sda): bad tree block start 18691697672960 1004421120
[ 389.280717] BTRFS error (device sda): bad tree block start 18691697672960 1004421120
[ 389.318514] BTRFS error (device sda): bad tree block start 18691697672960 1004421120
[ 389.362193] BTRFS error (device sda): bad tree block start 18691697672960 1004421120
[ 389.422418] BTRFS error (device sda): bad tree block start 18691697672960 1004421120
[ 389.461183] BTRFS error (device sda): bad tree block start 18691697672960 1004421120
[ 389.497624] BTRFS error (device sda): bad tree block start 18691697672960 1004421120
[ 389.532878] BTRFS error (device sda): bad tree block start 18691697672960 1004421120
[ 401.389158] BTRFS error (device sda): bad tree block start 18691697672960 1004421120
[ 403.059564] BTRFS error (device sda): bad tree block start 8316303979042573056 998653952
[ 403.071383] BTRFS error (device sda): bad tree block start 8316303979042573056 998653952
[ 403.072102] BTRFS error (device sda): bad tree block start 8316303979042573056 998653952
[ 403.090049] BTRFS error (device sda): bad tree block start 8316303979042573056 998653952
[ 403.106012] BTRFS error (device sda): bad tree block start 396704173628162400 998670336
[ 403.107432] BTRFS error (device sda): bad tree block start 396704173628162400 998670336
[ 403.108860] BTRFS error (device sda): bad tree block start 396704173628162400 998670336
[ 403.110140] BTRFS error (device sda): bad tree block start 396704173628162400 998670336
[ 403.126280] BTRFS error (device sda): bad tree block start 396704173628162400 998670336
[ 406.525805] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 406.527949] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 406.530056] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 406.532080] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 406.534091] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 406.536007] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 406.537956] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 406.539865] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 406.541762] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 406.543569] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 416.849852] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 416.852117] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 416.854322] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 416.856662] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 416.858840] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 416.861047] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 416.863196] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 416.865381] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 416.867591] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 416.869764] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 422.532323] BTRFS error (device sda): bad tree block start 7165861564597037388 996933632
[ 422.533516] BTRFS error (device sda): bad tree block start 999784448 996933632
[ 422.534476] BTRFS error (device sda): bad tree block start 7165861564597037388 996933632
[ 422.535365] BTRFS error (device sda): bad tree block start 999784448 996933632
[ 424.871466] BTRFS error (device sda): bad tree block start 12590409067 1000374272
[ 424.872421] BTRFS error (device sda): bad tree block start 12590409067 1000374272
[ 424.873458] BTRFS error (device sda): bad tree block start 12590409067 1000374272
[ 424.874312] BTRFS error (device sda): bad tree block start 12590409067 1000374272
[ 424.875649] BTRFS error (device sda): bad tree block start 12590409067 1000374272
[ 424.876553] BTRFS error (device sda): bad tree block start 12590409067 1000374272
[ 429.545139] BTRFS error (device sda): bad tree block start 7165861564597037388 996933632
[ 429.546534] BTRFS error (device sda): bad tree block start 999784448 996933632
[ 429.547642] BTRFS error (device sda): bad tree block start 7165861564597037388 996933632
[ 429.548650] BTRFS error (device sda): bad tree block start 999784448 996933632
[ 432.083805] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 432.085848] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 432.087897] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 432.089869] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 432.091914] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 432.093850] BTRFS error (device sda): bad tree block start 8371674126482743352 1001291776
[ 435.098886] BTRFS error (device sda): bad tree block start 0 1000341504
[ 435.101646] BTRFS error (device sda): bad tree block start 999800832 1000341504
[ 435.104012] BTRFS error (device sda): bad tree block start 0 1000341504
[ 435.106295] BTRFS error (device sda): bad tree block start 999800832 1000341504
[ 435.108705] BTRFS error (device sda): bad tree block start 0 1000341504
[ 435.111051] BTRFS error (device sda): bad tree block start 999800832 1000341504
[ 435.113378] BTRFS error (device sda): bad tree block start 0 1000341504
[ 435.115640] BTRFS error (device sda): bad tree block start 999800832 1000341504
[ 435.117906] BTRFS error (device sda): bad tree block start 0 1000341504
[ 435.120129] BTRFS error (device sda): bad tree block start 999800832 1000341504
[ 440.099530] BTRFS error (device sda): bad tree block start 3611942088783049055 997654528
[ 440.102167] BTRFS error (device sda): bad tree block start 3611942088783049055 997752832
[ 440.104640] BTRFS error (device sda): bad tree block start 3611942088783049055 997752832
[ 440.107175] BTRFS error (device sda): bad tree block start 3611942088783049055 997752832
[ 440.109592] BTRFS error (device sda): bad tree block start 3611942088783049055 997752832
[ 440.112096] BTRFS error (device sda): bad tree block start 3611942088783049055 997752832
[ 440.114394] BTRFS error (device sda): bad tree block start 3611942088783049055 997752832
[ 440.116648] BTRFS error (device sda): bad tree block start 3611942088783049055 997752832
[ 440.118804] BTRFS error (device sda): bad tree block start 3611942088783049055 997752832
[ 440.121236] BTRFS error (device sda): bad tree block start 3611942088783049055 997752832
[ 445.101710] BTRFS error (device sda): bad tree block start 3617621061289390641 998375424
[ 445.104404] BTRFS error (device sda): bad tree block start 3617621061289390641 998375424
[ 445.106915] BTRFS error (device sda): bad tree block start 3617621061289390641 998375424
[ 445.109603] BTRFS error (device sda): bad tree block start 3617621061289390641 998375424
[ 445.112021] BTRFS error (device sda): bad tree block start 3617621061289390641 998375424
[ 445.114484] BTRFS error (device sda): bad tree block start 3617621061289390641 998375424
[ 445.116753] BTRFS error (device sda): bad tree block start 3617621061289390641 998375424
[ 445.119032] BTRFS error (device sda): bad tree block start 3617621061289390641 998375424
[ 445.121235] BTRFS error (device sda): bad tree block start 3617621061289390641 998375424
[ 445.123421] BTRFS error (device sda): bad tree block start 3617621061289390641 998375424

I have another WD 2.5 "320 GB connected which does not have crashed so far.

I’ve tested the Seagate disk with Windows chkdsk and Seagete tools with long test, without errors.

Any ideas to find out where the fault is?

Thanks.
Carsten