Why won't my iPad 2 let me turn bluetooth on? This issue is about an interstate family member's iPad 2, so I'm afraid my knowledge of the issue and ability to troubleshoot are rather limited, but I'd appreciate any general help available.

The iPad is (or was) connected to an Apple bluetooth keyboard. It has been working up until today when, apparently, each time the bluetooth is turned on in the settings, it immediately reverts to being off. Is there a known or common reason for this to occur? Is there any solution?

I thought that it might be a power-saving thing, but apparently the iPad had near to full charge, and I can't think of much else.
Settings > General > Reset > Reset Network Settings. 

No loss of data, you'll just have re-enter wifi passwords and re-pair Bluetooth devices. 

If this fails then Restore.