my nextbook 8 tablet even when fully charged turns off by itself after five minutes of playing a game

[woowoo001]

My nextbook 8 tablet keeps turning off when i turn it back on but it is fully charged. I get fuve minutes of play time and it just goes black and i have to turn it back on to get five more minutes of play time before it goes black again..
.what is wrong??

 

[GeRgY]

Overheat is first. Try to cool down. Other things are bad.
Try to clean it and give him aditional cool.
If nothing happens get it to service.