Restarting and Resetting iPad
Restart iPad: Press and hold the Sleep/Wake button until the red slider appears.
If you can't turn off iPad or if the problem continues, you may need to reset iPad.
This should be done only if turning iPad off and on doesn't resolve the problem.
if the problems still not resolved
Reset iPad settings. From the Home screen choose Settings > General > Reset > Reset All Settings. All your preferences are reset, but your data and media aren't deleted.
Reset all settings: Choose General > Reset, then tap Reset All Settings.
Reset network settings: Choose General > Reset, then tap Reset Network Settings.
Reset the keyboard dictionary: Choose General > Reset, then tap Reset Keyboard Dictionary.
Reset the Home screen layout: Choose General > Reset, then tap Reset Home Screen Layout.
Reset the location warnings: Choose General > Reset, then tap Reset Location Warnings.
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