If you bought it secondhand, just double check it hasnt custom firmware installed. I used to get all those gapps messages wehn I used to mess around putting custom firmwares on android phones.
Think these tablets (all makes) have a limited lifespan then go haywire. Wife has a Nexus 9 which works with a full battery but once you get to about 50% the screen goes mental and there's a very loud screeching buzzing racket......