CMP170HX Not Mining - Powering Down

I have several CMP170HX . Three of them are now having this issue. They are detected by the Ubuntu, have normal temperatures and appear totally fine. However when i start mining they immediately power down and have 0 hash rate. I know it is not a power supply issue as i’ve swapped cables with working ones etc. Any ideas what the issue could be is there any way to diagnose this further?