Has the tablet said UI unresponsive? That’s when the touch screen freezes up. I just pulled my battery out and reset it on my phone but you may have to go to where ever you got said tablet from
Is it in an open area? If it is it may have the red ring of death…. which is bad of course but if it isn’t in a well ventilated spot Ie. a desk drawer or in a cabinet case the try putting it on top where it can breathe. I had this issue with my XB1 and i fixed it with a small fan blowing directly on the vents and as long as the fan is on the XB doesn’t get hotter then room temp. if it doesn’t work then try replacing the fan or air blasting it. it may just be clogged with dust.