My phone died and came back to life

My phone died then it came back to life what 10 minutes later I thought the location thing drained the crap out of it but then I felt like this happened I was watching YouTube videos then poof my phone shut down then I tried to turn it back on and it said it was dead later I tried to turn it on and it worked I wasent surprised but I don't damage it very much (my phone) not enough to do anything I didn't drop it in any liquid or hook it up to anything except the charger only from a plug and a car plug and maybe it was a virus? Any idea how to get rid of them if it was a virus of some sort