My first three flights yesterday MPH was working well. Today's MPH either showed 0.0 or every so often showed 0.4- .5 on full stick forward. When moving around by hand I can get it to read higher. I don't know if this is related but, today I also lost connection a couple times going out anywhere in between 1400 and 1600 feet. Altitude 250. It once lost connection where return to home initiated on it's own. will an IMU calibration help with these issues?