Garmin 945 - Watch not connecting to GPS during Runs - stuck on connecting and never connects

Hi Folks,

was on run last night and noticed a big anamoly on gps - when i came back and syncronised it to connect, realised first half of run was not mapped at all. 

Today, none of my run was mapped so the gps never connected. First time this has ever happened - have the 945 3 or 4 years now at this stage without issue.

I have noticed some condensation on the inside of watch around the outside perimeter - not sure if this is related or not ....

I have restarted the watch, hard restarted, reset factory settings - nothing has worked. 

Thanks