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GPS needs a lock on three satellites to accurately locate you
Four. Doing it with just 3 requires access to an accurate atomic clock as a time reference.
Just get the watch ready for the run earlier, especially if it has access to wifi or phone connectivity as most devices will now try to download bang-up-to-date ephemeris data over the Internet as that's faster than waiting for it to come down s.l.o.w.l.y from the individual satellites.
Or do 30-60 seconds stretching or warm up whilst the watch gets a better lock (i.e. more satellites), depends how much you value accurate reliable data.
Was dreading this mornings run in thanks to the rain/drizzle but it wasn't that bad at all, verging on semi-enjoyable.
Greenbank
It sounds like the issue Neil referred to from DC rainmaker is the cause then. The GPS signal should be fine in that environment. I’m guessing it doesn’t have a full lock, GPS needs a lock on three satellites to accurately locate you, and it gives false readings until it gets a lock. Moving delays getting a lock too.