Maybe it works if you delete a few apps and reinstall them again, but I guess you'd have to wait for the next update to confirm it worked.
My "when all else fails" solution (which I have used once) is: make sure everything is turned on in iCloud settings and all data had time to backup**, then reset the device (reset all content and settings). Once your iPad restarts, set it up as a new device (not restore from backup), then log in to iCloud and let it get everything back. Try to do this while somewhere that has a fast and reliable internet connection. Someone might suggest a quicker solution but there is always this if you getting tired of waiting.
The only drawback I found with this solution is having to reorganize icons again, but otherwise it ensures everything is set up cleanly. There may also be lost in-app data, like game scores.
**be particularly careful photos are backed up, which can be done faster with a lot of photos using iTunes to sync photos