What Kind of powersupply do you have? I had a simmilar issue with my gaming PC. It was operating fine for quite some time. Then I started to have power surges during intense sessions.
Your PSU might have suffered from your mining Operation, and if there was not enough headroom in Terms of Amps, it might now not be capable of Holding the voltages up.
you can try and use a Utility (like MSI Afterburner. Doesn’t matter your Card is not an MSI) to lower your power target for the GPU. Usually this makes it more Power-Efficient as well (If you devide the Hashrate/Wattage). Sure the Hasrate will go down, but you Need less Power to create each Hash. Best Thing is to lower the Powerlimit in 10% steps and leave the miner running you some Minute. Do the Hash/Watt calc and repeat until you find the max.
The most reliable scource for you wattage is a meter to plug in between your PC and the outlet. Depending on you Board, you might get some good info from the Tool “HWInfo”
Hope this helps!