I used to play wit h (crash) these airplanes... I got really good at rebuilding them. Anyway, I am also a real pilot.. and there might be a few reasons for this.
What type of terrain os in the area which this occured in? Is it over or near a pond/lake? (thinking about rising or sinking air).
I dont think it would be a radio malfunction, because the servi down for your airplane may be a servo up on another. Meaning why would they just dive.
It could have been a change in wind SPEED, which deacresed the lift available.
How big was the area where all the planes were crashing? Did it always happen, or randomly happen?
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