Why won't my tablet work without charge?

My samsung galaxy tab pro 8.4 SM-T320 will mot work without being constantly charging. If not, it will either:

-Flash the screen on and off, turn off, restart, and repeat until dead.

-Flash screen on and off, and die instantly.

I don't know what to do about it. I have lots of data on it, but I can't do anything with it because of this.

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@frankshooter start off by replacing the battery. A failed battery would exhibit the symptoms you describe. Always do the easy things first. Here is the guide for it Samsung Galaxy Tab Pro 8.4 Battery Replacement

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Thank you! I will try this soon!

crwdns2934271:0Ndz 24, 2017crwdnd2934271:0 Franklyn Silvas crwdne2934271:0

Samsung Galaxy Tab Pro 8.4