chuwi hi9 air crash graphic freezes

I have problems with my device. It freezes when using after a few minutes. A restart does not help.
How can that be done? Is it a software error or is the hardware broken?
Here I have a Youtube video showing what happens.

Youtube

I’m sorry to see that,please try to contact aftersale@chuwi.com, our service department will help you out with this issue. Sorry for the inconveniences caused.

Thank you for your apology. I will contact the service, but would be glad to receive feedback from other users with possible solutions.
Best regards
Arno