One year ago, I started with a PCE-FWS20 station of the same falily, and I also got reports of wind speed in the vincinity of 200 km/h. I also got a lot of annoying loose of contact although the distance between the console and the ISS was around 20-30 meters. Each time, I had to reset the console, un plug the main power supply, remove batteries, unplug the USB cable...
I think a possibility for the extravagant windspeed reports would be interferences with 2 other equipments in the station working in the same frequency range (868 MHz).
Tired of all those issues, I moved to a Davis, which works on the same frequency range, but uses frequency hoping and spread spectrum, and then is not sensible to interference from the 2 others equipments. I don't think your trouble comes from your computer side but from the wireless link between your console and you ISS.
Regards,
Marcel