High OS HDD Activity, High Avg CPU usage, Low Ind CPU usage

Hi, I wonder if anyone can help.

I appear to be seeing high OS HDD activity (specifically writes), High Average CPU activity (80%-100%) and but very low individual CPU activity (<10%) in the GUI dashboard.

Running top via SSH shows low CPU %tage with the occasional chown and guinicorn spikes (70%) which corresponds with the dashboard showing an increase in individual CPU usage that then drop back to nothing.