I’m not from Orbit, but I would suggest looking up your zip code on http://wx.aerisweather.com and see if the station that pops up recorded any rainfall. If it’s not accurate, then try to find another station close by that is. You can change the weather station in the bhyve app under “weather adjustments”. If there’s not an official weather station nearby, flip on the “Personal Weather Stations” switch and see if there’s one of those close by.
Also, the calculations run every night, so if you’re having connectivity issues perhaps that is affecting your timer as well. You might consider a wifi range extender. I’ve read how some people have good signal on other devices at the same spot as their timer, but the Orbit timer needs a stronger signal to maintain its connection.