Try this,... [It should not delete any of your data from the tablet. But presumably everything is downloadable anyway]
Power the tablet off .
When it is off, hold the volume down and power button at the same time.
When the boot screen appears, release the buttons. A menu will appear which is probably not familiar to you.
Use the volume button to move the cursor up/down onto "Format Cache"
Then press the power button to select "Format Cache"
When it finishes formatting, reboot it and see if it is better. [it is only formatting the cache, not the whole tablet].
If this doesn't work, then Zero's step is the next one.
Last edited by: No FM2R on Mon 26 Nov 18 at 00:48
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