The most likely cause of lost touches is an electrical issue. Several different electrical issues can cause touches on the touch screen to be lost or delayed. Here are some tips to try and solve this:
- Have you quit all apps and rebooted your device?
- Is your device running short on memory? Look in Settings App >
General > Storage. - Are you connected to a charger? Being connected to a charger can
cause a loss of touches from the screen due to electrical issues.
Also I've noticed that if my iPad is touching my computer that I can
see lost touches. - Wireless chargers can cause lots of problems. Look at our
video on what happened
near a wireless charger in a Starbucks - If using the 1/8" jack to connect to a sound system, be sure to connect to an electrically isolated input. Stray voltage on an a non-isolated input can interfere with touches on the screen and can result in lost touches.
- Have you looked at our notes
on tips
for live performance?