My Samsung galaxy S6 froze last night after making a phone call

[AC Question]

I tried to switch it off and restart, but that didn't work. I let the battery die. Started to charge it, and it wouldn't turn on. Black screen with blue flashing light. Rebooted it last night and left it on charge. It started fine this morning, messages came through. Soon as I started checking message etc. it froze again and switched off. Now it's switched itself back on and just shows the Samsung Galaxy S6 info and nothing further. This is the first time it's played up. Whats going on?

 

[B. Diddy]

Welcome to Android Central! Force a shutdown by pressing and holding Power and Vol Down for about 15 seconds. Then try booting into Safe Mode and see if the problem persists: https://support.t-mobile.com/docs/DOC-27586