S7 Edge Random Restarts

[Craig321]

My Edge, since Nougat has been restarting a lot. It would do it on Android 6 as well but not as frequently.

I reset it back to factory yesterday using the factory reset option in the settings, but I just saw it reset itself while it was doing nothing on my desk :/

Any ideas before I sent it off for repair? It's still in guarantee, but I'd rather fix it myself if possible.

Thanks