Are you still getting the emails from Wunderground? Two days ago we found that our weather script is taking a significant amount of time to obtain sunrise/sunset time from openweathermap.org, so we immediately changed the script to use Python to directly calculate sunrise/sunset times. Although this is not directly related to Wunderground, if the script takes a long time to return, it can cause the controller to resend another request, and thus exceeding the call limit. I hopefully our fix to the weather script has eliminated the exceeding call limit problem.