Hey there. I flashed the ROM from the update section of the alldocube website for M8 and got the same problem. My version was M8 V1.1 20190122 and the one on the website is M8 V1.0 20181201 (and it was saying it was actually from 2019 05 20, but they didn’t update the download link).
ANYWAY, to fix it I used the factory reset. Settings > System > Reset > Factory data reset
It worked flawlessly.
If you still have this problem, try searching maybe for a version dated like 20190122 or something and flash the ROM.
