I had the same problem with my nvidia cards
rtx 2060 gtx 1080 gtx 1060 gtx 1660 ti after more than 2 weeks I was relentlessly I had to completely reduce the oc
rtx has minimum tdp core clock -502 and memory +500
same for the 1660 ti tdp minimum core clock -502 and memory +600
gtx 1080 minimum tdp core clock +100 and memory 200
gtx 1060 tdp minimum core clock 75 memoir 200