Apple Watch 3 Nike+ Run Club issues

I have always ran with just my watch (series 1-3). Since November I have done a couple runs using just Nike+Run Club on my watch. The app appears to be working just fine however when I get to the end and try to stop - hit the pause button - it brings me to the end or resume screen - and it won't allow you to pick end. So then it disappears and the run is completely gone.

I have checked on the app on my phone and tried to sync runs on the app however nothing shows since Oct 10, 2019. I have now lost 2 runs the same way.

Checked the Activity Tracker and half of the run is logged as activity in the exercise ring but missing from showing the run.

Rebooted the watch - nothing changed. Don't know what to do..... Upset that I'm losing the data from my runs