Try to reset your device.
Device Reset (won't affect settings/data/music/apps/etc)
1. Press and hold (& continue to hold) BOTH the Sleep/Wake button & the Home button.
2. Continue to hold BOTH (ignoring any other messages that may show) until you see the Apple logo on the screen.
3. Release BOTH buttons when you see the Apple logo and allow the device to boot normally.
Aditionally, try to to reset your settings (make note of what they currently are to easily re-enter them after the reset):
Settings>General>Reset All Settings (this will NOT affect music, data, apps or otherwise)