I'm having a problem with my R9 270x gpu. After a couple minutes of use, the screen will freeze and then my monitor will have no signal. I had this issue in windows 8; I now have windows 10. Everything is normal using an Nvidia gpu. I am using the latest amd drivers. I've also RMA'd both my GPU and mobo and Gigabyte told me nothing is wrong with them. Any help is appreciated.

Specs: Windows 10
Gigabyte R9 270x
Gigabyte b85m-d3h Mobo

Not sure if important: when the monitor becomes unresponsive, my gpu sounds like the fans go to 100% for a second, then rests, then repeats.
Thank you.