After a few hours of bluetooth enabled, it stops connecting to pre-paired devices. In this state, the searching mode is also not working (it says it's searching, but finds nothing), and attempting to manually connect to a paired device doesn't work either. The only solution so far is to turn Off Bluetooth, and then On again. Any idea how to fix this? I've got 4.3.1 installed. BTW, I've been using the same bluetooth headset (Motorola H720) with my previous 3GS and it worked flawlessly.