Looking at your image that looks like a hardware fault. Is it new, get it fixed under warranty if you can.
Chris | Admin
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Ordered and waiting for my: BMAX S15 & Teclast F6 Plus
Currently testing: LG G8X & Redmi K30
may be so. they said flash Os and i performed it. but no change at all. purchased Dec. 17 last year in Ali. i emailed them but i heard it may be costed !!
um, and this error is succeeded only for 3-4seconds. of course after and before that, it works well. if it is a hardware problem, i think it would be appeared for such a duration from the starting tablet and power-offed automatically.