I was flying my P4 after not using it for about a month. I flew it about 1800 feet away and about 500 feet high. There was a bit of wind (maybe 10-15mph) but didn't seem too bad. I had it in sport mode and was going about 40-50mph. I stopped the drone for a minute because I was talking to someone. After that I tried moving, but it wouldnt go anywhere. It went up and down fine, but wouldnt go past 4mph horizontal speed. Anyone have any idea what could have caused this?