@tonyhr0x welcome to the Rockstor community.
I am assuming you are running the version 4.x of Rockstor?
If the cables are not helping (I assume you replaced/changed for all three drives?) then you might face a failing drive. Take a look a @phillxnet response to a similar issue:
take a look at the S.M.A.R.T. page as he recommends.
If it indeed turns out to be a failing drive, you can follow the drive replace steps found in the documentation:
https://rockstor.com/docs/data_loss.html#btrfs-replace
Are you seeing any other symptoms (e.g. random reboots of the appliance, etc.) which could point to a failing power supply (I ran into this issue quite some time ago, but it was very hard to pinpoint that it indeed was a power supply problem and not bad memory or something else).