[Advice] "accessory unsupported" message randomly displays when nothing connected
I woke up this morning with my iPhone in its dock, charging, and noticed the "This accessory is not made to work with iPhone" message, asking if I'd like to enable Airplane mode. I found this strange, and since then, the message has been displaying periodically all day, despite the fact there's nothing plugged in. WTF? The only thing I changed yesterday is that I installed SwirlyMMS.
pwned iPhone 1.1.4 (04.04.05_G) 3.9BL
Activated, Unlocked, Jailbroken on T-Mobile USA
Anyone have any ideas on how to fix this short of a restore?