I have an Aercus Weathersleuth and the clock on it has gone haywire, it is always slow sometimes a couple of months, sometimes an hour or so but not exactly 1 hour. It seems to advance by a minute every 5 or 10 minutes. It took me ages to spot this behaviour but if the time is quite wrong it will not log to Weather underground. I use Weewx in observer mode which intercepts packets and forwards to WU, once I had identified the problem I substituted the time from the Raspberry (running Weewx) in the interceptor code and forward this to WU. Now works fine. In my case It also forwards to Emoncms which works fine too.
