My X3 just froze. Probably the worst I've experienced so far.
I tried to turn it on with the lock slider on. As soon as I got the warning that it was locked and that the X3 would shut off, I slid the lock slider to the off position. This caused the X3 to freeze. I held down the power button for 10 seconds to power off the X3 and then powered of back on. It was still frozen. I reset it and it was still frozen. I finally powered off, removed the SD card, powered if back on, and if finally worked. I thought for a minute that I'd bricked it and am glad it finally unfroze!