Please use the code tag to paste kernel logs, my take on this issue is that you damaged all those 20 PSUs by feeding them improper voltage or any other electrical related issue, the PSU acts differently when plugged elsewhere gives more strength to the theory, to confirm/deny this theory use a PSU which has not been plugged in that "bad" area of the farm on one of the "bad" miners, obviously, the test should be done in a different outlet/area, chances are it will work perfectly fine, if not -- then there is even worse news, which I doubt for now.
Looks like I solved the issue. The back of the psu is heating up. Even though the chips are cool and the pcb is cool and the psu is cool. The very back of the psu is not. I think the fans on the psu are not fast enough and cause this issue. Make sure you remove all the heat. This problem does not exsist on the S17 series and its only on the S19.. Watch the video.
https://www.youtube.com/watch?v=qg7HFFAkB7A