What should I do? My SAMSUNG5 was in my pocketbook, TURNED OFF & HOT?

[AC Question]

What should I do? I NOTED that if I leave it on the case does not get hot, but I have to charge it more frequently. My SAMSUNG5 was in my pocketbook, and had been turned off while we were in a restaurant for dinner. It was TURNED OFF, ..3 hours later, when I went to turn it on I noticed it was VERY HOT??

 

[belodion]

The battery may need replacing, among other possibilities.