My canon keeps turning off on its own.

My canon keeps turning off on its own.

My canon had been working just fine and out of nowhere it started turning off on its own. The screen goes black after a couple of photos for no reason. Every time this happens I take the fully charged battery off and put on my 2nd fully charged battery. Then it turns on again and allows me to use it again for some photos and ends up turning back off. If I simply take it off and then put back in the same battery it doesn't work. I have to put on the other battery. Either way it ends up dying and it only works for a while when I change the batteries. There's no message at all. The screen goes black and it won't turn on.