Have you tried a reset? From manual page 154 (iPad User Guide for 8.1)
Reset iPad. Hold down the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears.
Or you could try a network reset, on the same page
Reset iPad settings. Go to Settings > General > Reset, then choose an option:
- Reset All Settings: All your preferences and settings are reset.
- Erase All Content and Settings: Your information and settings are removed. iPad cannot be used until it’s set up again.
- Reset Network Settings: When you reset network settings, previously used networks and VPN settings that weren’t installed by a configuration profile are removed. (To remove VPN settings installed by a configuration profile, go to Settings > General > Profile, select the profile, then tap Remove. This also removes other settings or accounts provided by the profile.) Wi-Fi is turned off and then back on, disconnecting you from any network you’re on. The Wi-Fi and “Ask to Join Networks” settings remain turned on.
Failing the above, I am sure cleverer/ more knowledgeable suggestions will be along soon...