Don't think Bitmain has a way of or even care about you flashing a different firmware, but going through the warranty process can take forever which is why in most cases it's more rational to fix your own issues.
Your issue may be related to the voltage meter you talked about, remove that and let it run for a while.
Your issue may be related to the voltage meter you talked about, remove that and let it run for a while.
Since the original post, i had the miner running in High Energy Mode (136TH) for 48 hours and no hashrate drop, still the log errors but that's all.
After that, i changed to standard mode at 120 and it's running since Friday.
So i think for now, i will keep it like this on the stock firmware if the hashrate is not dropping anymore. As we say, "it's working, dont touch it"
what do you think ?
yeah leave it alone and do not over clock it.
good luck with it.