after i "upped" the voltage on my PSU the miner behaves slightly better. it's a B3.

I have to do a system reboot if i made any changes such as fan speed or freq, a save & apply don't work.

Also try to power everything off for like 30 secs & power it again.

The 3 methods worked for me, ***HINT*** higher freq does not always means better.

I noticed that 2 are good boards & 1 is a little "cuckoo" & it will not go up to certain speed or might drop but setting lower freq improves it & much less HW errors but for the other 2 remaining "normal" boards are working as it should. In my case it's chain #1.

PSU is DPS2000BB. Hope this helps.