My 945 generally has no issue connecting to the Garmin Connect app. I get slow uploads of data, but at least the device will connect.
The relatively new "Connect IQ" app however is a different story. The device regularly is shown as "not connected" in that app despite being connected in Garmin Connect, and to the phone (synced etc). There does not appear to be any means to "connect" in Connect IQ so are there any suggestions on what to do force the connection? This is a great example of another bug like DC Rainmaker described, things that should work just don't.
Connect IQ is pretty great at updating apps and searching for new apps, but it doesn't do much good if the watch won't connect!