P106 random 100% fan spikes

Hi, i have a 12 x asus p106 samsung memory rig mining eth with phoenixminer and having few problems that i want to get cleared

  • first problem is that with auto fan or without on random gpus fan spikes to 100% tried to update drivers - no change. And manually setting fan i have the same issue.

Other problem is that i cant overclock to get stable above 23mh best i can do is 22.36 with mem 400 pl 90 if i increase more than in couple of h i get gpu driver error and no temps with high LA with phoenixminer reboot.

Any tips on what could be the problem?