Hello!
I also had a problem with hash rate losses, but there are absolutely no reports of any registered problems that would cause this!
This annoying problem appeared to me about 10 days ago, and before that I did not change anything in software or hardware.
I dig with 8 cards, mostly 2080ti 2070 super and one 3060ti FE, but after reading the comments in the topic I understand that this problem occurs with any video card, regardless of brand or class.
I see that, unfortunately, no one has yet discovered what the problem is and, accordingly, what its solution is.
I will share that what I notice is in the day I always have 5 or 6 breaks of 10 minutes and sweats are always concentrated between 23:30 to 2:00.
Today, however, I have a hole of more than 8 hours and this made me extremely nervous, so if it happens again tomorrow, I leave HIVE OS!