i had the same issue. One day i started my PC and my GPU was 100% load with 60 degrees idle mode without doing anything at all stable for at least 30-40 minutes in that time i runned a hole computer scan with my antivirus software (AVG) nothing happens then i got really scary. I dowloaded a specific program for this bitcoin mining thing i runned again i hole PC scan 0 viruses found, i checked the task manager for an unknown program running but nothing my CPU was at normal usage. Then i restarted my PC and the problem dissapeared and again several times and my GPU never had this problem again. Im little bit of worried for what happened that time my GPU is 0% load now in 35-50 degrees normal idle. But i have some concerns do i need to worry ??? THANKS!!