Its sign thats something is wrong /gpu stress/dying gpu/. U shouldnt run 24/7 mining when u have artifacts.

You can try to change your mining program. I have artifacts when i use phoenix miner.or decrease intensity )

You are mining btc, check your bat file for comfiguration, or try reaper )

Do you do overlocking?

Hello, im now mining Ltc with 3x7950 and 2x 6950 1x5830 on various pools, because of lot ddos and pools unstability.u can catch me in charts under Falout nickname ).