Most of the time it works ok, but sometimes after Windows startup there's just no data stream coming from the GPS COM1 port. Pressing "Cold Start" in GpsInfo makes the receiver respond "OK", so it's still there, but there's still no data stream. The only way I found to fix it is to shut down the PC and restart it (simple reboot doesn't seem to work). Does anybody know what the problem might be and how to fix it?