Hi,
I know of one with just the same issue.... Brand NEW straight from box we only got this last week - updated to new firmware as it requested on app screen, upgraded all perfectly fine, we re-calibrated compass now it only has 20 to 40meter "RC" range - everything works beautifully just we don't have no range !!!! so its on its way back to supplier for a replacement. Video range works perfect at all times BTW. The app shows RC signal warning in Red at the top of screen, video works fine I can see from the camera, app works fine, just RTH switches in and the drone fly's home and lands. So we don't really know if this was a fault in the drone or a fault in the software, as another friend updated his no issues and has superb range!!! - A mistery...