Why does my Note 4 constantly restart

[AC Question]

I was on my phone like normal and it shut down, since it did that it will not do anything but keep restarting, will not go to any other screen (ie homepage) because it will not get that far without restarting again. I thought maybe it was the power button but it's not, I also took the sim card and battery out and no luck. Any suggestions what may be going on??

 

[belodion]

A bad battery? A faulty Power button?