Range:
The only range problems I had were with a GWS pico receiver in the Tiger Moth. The plane suddenly dropped out of the sky from about 100' feet up and maybe about 500 feet away.
There was plenty of power left in all the batteries.
Luckily there was no damage to the plane as it went through some bushes on the way down.
I had to replace the receiver, apparantly the crystal driver circuit is very sensitive and may have been killed by the crash. Funnily enough, the new receiver, although it was the same type, had an aerial twice as long....
Bad Landings...
Someone at my field is just starting to do landings, and on two occasions now he's had to go home early because he's ripped his nose gear off.....
On my Sturdy Birdy my instuctor broke two of my props on consecutive flights on landing, he couldn't flare the plane properly and get the nose up, until I told him the elevator was on low rates....