Did you change any settings on your device? You could conceivable have uploaded something that removed the UART connection, but it seems super unlikely.
Can you connect from your phone?
It could just be the bluetooth stack getting in a twist. Try running sudo /etc/init.d/bluetooth restart in the console?
sudo /etc/init.d/bluetooth restart
On my laptop I have occasionally had the whole btusb kernel module getting confused. While I could post the commands to restart it, honestly you might be better just trying a restart and seeing if that fixes it?
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