Chain volume drop or chain malfunction?

Hey folks, I've got 4 S19 Hydro miners that were running smoothly for almost a year... Now I’m facing issues where all of them are failing at the same time. One is showing a chain break error with the vnish firmware, while the stock firmware is indicating a chain volume drop. They’re all connected properly to the 40 kW voltage regulator, and the coolant temperature is holding steady between 29 and 33 degrees. Any idea what could be causing this? I’ll share the full kernel log later.

looks like a psu issue. you ran for 7 hours and then had a huge voltage drop 2024-12-01 06:20:12 30m avg rate is 198042.53 in 27 mins 2024-12-01 06:50:20 30m avg rate is 198409.49 in 30 mins 2024-12-01 07:20:23 30m avg rate is 198275.55 in 30 mins 2024-12-01 07:21:56 chain avg vol drop to 0.94 2024-12-01 07:22:08 chain avg vol rise to 19.70 my guess is the psu's are failing.  you ran them over clocked from 158 to around 198 th

They are stock 185 th. But i found the issue i think my energy has quick voltage drops like all three phases 400v to 380 then 340 after this voltage regulator cannot handle it these big drops and miners are failing. I am really happy to find this today i hope the electric company fix this issue tomorrow