My Mini is a stock mini 2.5 Core i5, 16GB RAM, and a Radeon HD 6630M, and has recently begun to restart randomly. Usually this occurs when left idle for ten to twenty minutes. Using it the entire time seems to prevent this issue from occurring. I reformatted and freshly installed Sierra and the issue persists. The RAM was added about six months ago, but the restarts are a good deal more recent that that.

When the computer restarts, it doesn't indicate a kernel panic.

No idea what to do, thank you for the help!