Just a heads up to anyone using this type of station. I just encountered the wind data loss symptom after almost 4 1/2 years after the installation. All the reset processes, battery swaps etc. had no effect to bring it back. After opening the the wind sensor up to check it out I noticed the solar panel connection to the circuit board corroded to the point of disconnecting. After cleaning it up and re-soldering the connections it came back to life and has been running without drop outs again. I'm suspecting the 3 little "weep holes" around the bottom let enough humidity in and caused this to build over the years. The connection must have deteriorated and the sensor continued for a while until the RAM batteries could no longer support it. They both read about 1.2v when I checked them. After the corrections where repaired they started charging back up and once they reached 1.4v I buttoned it all back up and remounted the sensor. 3 days so far and all is back to normal. I probably should have coated the solder joints with something to prevent this from happening but didn't think about it at the time.