Are you having these problems when it's rainy and windy, during a thaw, or seemingly at random?
As previously mentioned, the batteries could be an issue. If you're changing the batteries frequently, a short in the transmitter could be draining them, but cheap batteries might do the same thing. This time of year, they don't last as long as they would during the summer, especially at your latitude.
You indicated in your other thread that you checked the transmitter and the cables. Not sure exactly what you checked, so I'll ask... when you're showing dashes on your console, have you put the transmitter in test mode and checked the LED to see if its flashing (transmitting) every 2.5 seconds? Have you checked all the connections for signs of moisture or corrosion?
Do you have enough anemometer cable to connect it directly to the ISS (or bring the anemometer closer) to bypass the transmitter to see if the problem persists?