Tablet won't turn on easily

A

AC Question

I have a Samsung galaxy 10.0 2014 edition and it turns itself off and then I have problems turning it on again. It is now fully charged and I started it eventually on the battery rather than plugged it, but it took many attempts.
It was showing disk full but I have deleted some pics and it has resumed normal updates etc. Wondering if I need to delete more incase this is affecting the standby mode.
 

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