I had an interesting one just about a week ago. Got to the the field and found that my RX switch had been bumped on in transit. Since is is only a 10 min drive from home I knew I should be OK to fly a couple of times w/o trouble and there were only 2 of us on field and no ESV. On the second flight as the plane gained distance it began to act strange and I immediately brought it back and landed. It flew OK in close. When I got back to the pits I also could not remember for a FACT if I had ever extended my antenna or not nor could the other guy. 2 possible goofs in one day, time to go home for sure. Didn't even check the batteries when I got home, just put it all on charge to be sure.