I got this when I installed bluez by mistake and then tried to remove it, next time I rebooted it went into overdrive turning off & on. Even taking the battery out didn't help. Couldn't get it to stop and only solution I had was to reflash, but luckily I had done a backup the previous day, so didn't lose much.

I'll keep an eye on this thread to see if you come up with any solution, just in case it happens to me again.