Help me my Iphone is acting weird

So I don't know how to put this in a story. But I was playing on my phone at like 8:00 pm and suddenly apps begin to act weird. It takes like a 5 second delay until that app is opened and sometimes when I open an app it closes. So I shutted down and turn it back on my phone and the apps still do it. Buy I notice my phone was on low battery. So I charged it and it keeps going off and on. Also when i try to shut down the phone, it turns off by itself, like not in a restarting way. More like a way when you press the power button one time (not holding it) and it turns off.

Factory Reset would be the best thing to do

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