Clean the Screen:

Dirt and smudges affect touch sensitivity. Clean with a microfiber cloth. Remove screen protectors temporarily to test.

Restart the Device:

A simple restart resolves many touchscreen glitches. For phones, try a force restart. Hold power button for 10-15 seconds.

Check Touch Settings:

Settings > Bluetooth & devices > Touch. Verify touch is enabled. Some devices have toggle switches.

Recalibrate Touchscreen:

Control Panel > Hardware and Sound > Tablet PC Settings. Click Calibrate and follow instructions. Improves touch accuracy.

Update Touch Drivers:

Device Manager > Human Interface Devices. Update HID-compliant touch screen driver. Or uninstall and restart for automatic reinstallation.

Check for Physical Damage:

Cracked screens may lose touch in damaged areas. Water damage affects touch sensitivity. Professional repair may be necessary.

Conclusion:

Driver updates and calibration fix most software-related touch issues. Physical damage requires professional repair or screen replacement.