Samsung SM-J710MN User Manual

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Appendix136The touchscreen responds slowly or improperly• If you attach a screen protector or optional accessories to the touchscreen, thetouchscreen may not function properly.• If you are wearing gloves, if your hands are not clean while touching the touchscreen,or if you tap the screen with sharp objects or your fingertips, the touchscreen maymalfunction.• The touchscreen may malfunction in humid conditions or when exposed to water.• Restart your device to clear any temporary software bugs.• Ensure that your device software is updated to the latest version.• If the touchscreen is scratched or damaged, visit a Samsung Service Center.Your device freezes or encounters a fatal errorTry the following solutions. If the problem is still not resolved, contact a Samsung ServiceCenter.Restarting the deviceIf your device freezes or hangs, you may need to close apps or turn off the device and turn iton again.Forcing restartIf your device is frozen and unresponsive, press and hold the Power key and the VolumeDown key simultaneously for more than 7 seconds to restart it.Resetting the deviceIf the methods above do not solve your problem, perform a factory data reset.Launch the Settings app and tap General management → Reset → Factory data reset →RESET → DELETE ALL. Before performing the factory data reset, remember to make backupcopies of all important data stored in the device.