The latest update T500XXU2ATK3 (EUX) on the Tab A7 SM-T500 renders the tablet unusable since it makes the touch screen stop recognizing inputs intermittenty for a few seconds every time.
This issue appears after updating via OTA from T500XXU2ATJ6 (a 300mb update), doesn't get fixed after a factory reset, but also happens on a brand new install of the whole T500XXU2ATK3 firmware right from the first screen after boot where I have to choose a language.
After reinstalling T500XXU2ATJ6 the tablet works perfectly, so it's not a hardware issue.
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Thanks for your post and pm!
My tablet is back to normal now after downgrading to T500XXU2ATJ6. I can watch fullscreen video and play games without the screen flickering to black!