I have noticed this also .. I have one VVP with a Serial connection to the VP1+ console, 4 COM ports used by WL, WD, VWS, Cumulus, and 4 TCP/IP ports (used by Meteohub, WeatherCat, WeatherSnoop) and one port used as console source for a VVP running on a different system on Win7 (that runs test copies of WXSolution, wview, wswin32, Cumulus and Meteobridge through com/tcp-ip and Enterlogic Virtual Serial Port).
What I've observed is that on the TCP/IP connections, sometimes VVP will try sending LOOP nnnn of 255 (nnnn>255) and will only reset if you disconnect the console for 10 seconds, then reconnect. Restarting the virtual port seems to have no effect, but the short disconnect of the console does reset so it will work when the weather software reconnects.