Sorry to hear you had the same problem, seems like the materials or the built quality is just not good enough for these cheap tablets to hold too long, as well as a design flaw
since then I’ve sent it back to the seller for a refund and got a 14″ laptop with the new 8th generation Intel processor, and a decent nvidia GPU, I barely used the tablet as a tablet anyways, and the laptop is actually lighter than the tablet+keyboard combination.
of course the price is about 4 times higher, but I think its at least 10 times better.