Tab 3 shuts down when playing minecraft?

Hi guys,
I keep on having this problem. It happened ages ago and now its doing it constantly. Everytime I go on Minecraft the screen flashes and the tablet shuts off. It doesn't seem to do it with anything else. What can I do? My tab has charging issues, i.e drainig fast. I don't want to have to uninstall minecraft because I have made loads of good worlds which I've spent hours making. Sometimes, after the tablet stops restarting there seems to be a chunk error with the worlds.
Please help ASAP, All help appreciated
many thanks

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