I had 2 units, but i’m trying to return one of them. I’m glad you have no issue with you tablet. Warranty? I’m not very confident about this…
Finding this issue in an article about the tablet it’s very significant… perhaps it’s a common issue.
Where did you buy your tablet? Aliexpress?
Did you modify graphics bios settings? It’s weird, because on bios screen or boot menu i have no issue, it is showing after loading android or windows.