alas, Bitmain just can't make a perfect gear again, it has been the case for years, the 17 series had a huge failure rate due to bad solder, and now the 19 series has a high PSU failure rate, you are not alone in this, I see many folks on telegram complain about these PSUs, including those who have perfect electricity setup and thus it isn't an issue with electricity whatsoever, Bitmain must have messed up with something in that PSU, they probably used a cheap component somewhere to save a few bucks resulting in the failure of mining gears which they sold for a few thousand dollars.