Factory reset - now bluetooth fails..

A few recent issues with my Fenix 5 Sapphire so ended up factory resetting. Now whenever I try to connect via bluetooth to my Moto G5, it will offer the pairing code, accept it, then wait 10 seconds and say connection failed.

I have tried clearing data for connect, reinstalled it a few times, but no joy.

Any ideas?

Thanks

PS - I have tried using my vivoactive HR and that pairs fine :-/