Yes it sounds like your GPU may be failing. What OS are you on, are your drivers up to date? Is Ps the only application you are seeing this issue in? If you are on a Mac you could make an appointment to have diagnostics run which will show a pass/fail on your graphics processor.
How much memory do you have allocated to Ps? How much free space do you have on your local drive? Do you have multiple applications/processes going at the same time?
Thank you very much for your answer.
Windows 7. Drivers up to date. Computer has 16mb of RAM. 250 gb free on hard drive. Photoshop the only application that's giving me this problem. Happens even when Photoshop is the only application running. The allocations are just the defaults from Photoshop. I didn't change anything in the Preferences regarding this. It says "Let Photoshop use 10143 mb (70%).
Eventually I'm going to get another computer; so maybe I just have to accept this bug for a while until I do get another computer.
Be sure to back up your files in the event of a hardware failure. You may be able to live with this glitch for a short while however it will be painful if you can't recover lost work files.
That's right. Good tip. Thanks. Right now I have everything double backed up, and eventually I'm going to have it all five-times backed up: two portable drives, cloud, two DVD-RW.