High load average - RTX 3090

Hi, I have a problem with High load average. I have a 4 x RTX 3090 (3x PNY and 1x MSI gaming x) and motherboard Asrock h110 pro btc+ PSU: 1500w platinum. GPU temperatures range from 39 to 44 degrees
Overlocking:
Core: -300
Memory: 2000
Power: 300
Fan: 100%
I use Nb miner and it takes me 9 hours and then i get to the red numbers High load average. Only one card works and the other 3 are as if disconnected.
Please advise me how to solve this?

did you try lower OC settings?