After 2 - 5 minutes of being still, or 5 -30 minutes of travel, the navigation program running on my laptop in my motorhome (apparently) looks for another connection OR the COM Port is diverted (by something?) and the GPS info freezes. 75% of the time, merely stopping and restarting the GPS-portion of the program (4 non-"Snap-to-Default" mouse clicks [while driving]) and I'm back in business. The rest of the time, the program forgets what COM Port to use and I must un-plug then re-plug the GPS and manually select the correct COM Port (Those times require a full-stop).
I THINK that, if I could "un-share" my COM Port 20, the program would have no reason to get "off-track", and my problems would go away.