Re: PhoenixMiner 5.4c: fastest Ethereum/Ethash miner with lowest devfee (Win/Linux)

did you (or the pc) reset some settings in nvidia controll pannel?

No, yesterday the hashrate was changed automatically while mining

I fixed this issue by upgrading win7 to win10. Linux is OK too.
no need for a new serial shit even if your win7 is weirdly registered

I upgraded one of my boxes to 10 and it fixed the problem without any other updates or anything else needed. Thanks for the tip.