Fenix 5X plus - Version 9.00 & iOS 13

I'm having endless issues with syncing. When I try sync the watch on the app it starts then just fails, and brings up a red exclamation icon saying "Sync Failed" if you tap Sync Now, it still fails. 

Something not right, and I don't know if it is iOS 13 (ver 13.1.3) or the watch version. I have unpaired and repaired with no luck at all! 

The only way I can sync now is if I plug it into my PC and use Garmin Express

Any ideas on how to fix this, very annoying, issue?