Why does my tablet overheat and restart?

So, I have had my Galaxy Tab A for almost a year now and his is the only issue I'm having. My tablet will be hot to the touch (sometimes not) and will the commence to shut off instantly and then right after restart. After it turns back on, the issue will usually reoccur within 3-5 minutes. Also, when I change it, it will have absolutely no issue. To add, it will charge very slowly. This version have will not let me access my internals. Send help fast!