My tab a8 randomly press a portion of my tablet thatsuddenly change the app or press different keys. I tried tofactory reset already but the problem is still there
Seconding what summeRamirez said - please run the diagnostics tool through your Samsung Members app (check your Support tab) to see if there are any hardware issues.
You may also check if your hands are moist when touching the screen - moisture conducts electricity, which messes with the touch sensors on your screen.
I tried the diagnostic test. It is all normal. But there is unexpected time that it would point in an area even though you pressed in different part of the screen.
Try to check if the following might help: - Wipe cache partition (and/or Repair Apps) - Toggle "Touch Sensitivity" on and/or off
If you have a newly-placed tempered glass on your screen or if you had a software update recently installed, these could be factors too.
Although if the ghost touches still persist even after a factory reset, it's possible that the issue is already at hardware level.
You may also do some screen touch tests/diagnostics to check if a part of your screen is no longer working/responding to touches (especially around the area where the ghost touch happens). If this is the case, then the issue may be caused by hardware malfunctions. One way to find the exact area where the ghost touch occurs (if not yet determined as of now) is to do a screen recording and turning on "Show taps and touches."
You may also consider visiting an authorized Samsung service center to be sure. If the problem has been found to be at hardware level, then replacing the actual screen is needed.
