So I have noticed that sometimes my phone will randomly restart itself during the night.

It never really happens during the day, it works fine. But every now and then I would wake up and my phone would ask me for my SIM PIN. After I type it in and unlock my phone it would start optimizing the apps, just like it would after you reboot it.

I checked the auto restart setting (or however you say it) and its not on. Is there some other type of setting for this that I could possibly have on? Or does it mean that my phone is having issues and will slowly start to restart itself more often?

It doesn't do it every night though so I am not sure..

Thanks.