I’m having the same issue with my runner2 watch. Since the update to 1.7.60 it refuses to pair with my iPhone running Tom Tom Sports 10.0.0. I’ve tried a factory reset on the watch and redownliading the phone app, and forgetting and re-pairing the watch. Sometimes it gets as far as the pairing screen on the watch that shows the code for Bluetooth pairing but only for a fraction of a second before flicking back to the previous display. Very frustrating!