Make more Ram available (Delete/close unused applications that may be running> Re-calibrate screen usually found in settings> Reset (Can be found here [[NuVision TM1088 Troubleshooting]])> Realign display (requires opening device) >then maybe a replacing something but need more info. [br]
If you can post pictures of tablet and what it is doing that would be helpful. Is it part of screen or full screen? Is the screen damaged? What happened prior to this occurring (if you know, i have kids so i understand that “all of a sudden” it doesn’t work)?