My phone will no longer stay in "Airplane mode". When I turn on airplane mode and send it to sleep it will exit airplane mode automatically after about 20 seconds.

This only happens after I use an accessory that connects my iPhone to the car stereo. I need to reboot to get rid of this bug - then it will stay in airplane mode like it should.

Has anybody else noticed this? Is this only happening on jailbroken phones?

Is there a quicker workaround than rebooting?

thanks, chris