Describe the area that you are running in. Any airports, high tension lines, transformers, stuff like that. If it were just your buggy I would think it had some kind of short in it and the landing made it more pronounce. But to have three of the same type buggy do it would likely rule out that it had something to do with the buggies. And it gets even stranger. If it were outside interference, why only on the landings ? Hmmmmm.....strange.
Here's a stretch. Ever heard of EMI? Electro Magnetic Interference.
Whenever metal touches metal you get it and when this happens a frequency of some unknown number is generated. The military spends tons of money on trying to overcome this 'natural' phenomenon. If you have a radio antenna that operates on a certain frequency and on a windy day the chain that secures the fence around it starts to beat itself against the metal fence, a frequency is created and causes interference with the radio antenna. Some cases it's minor, others can be severe. Sorry, got off track but here's mypoint. You have metal to metal contact that occurs on your buggy and maybe the hard landings is enough to cause some weird frequency interference with the rcvr. The shock springs rubbing against the shock body, the dogbones inside of the output cups, something like this. EMI is real. Is it a big problem with RC's ? I wouldn't think so, but something is causing your problem. Like I said earlier, if it was just one buggy I would look at the problem being with it. But to have the same problem happen to all three, and of the same type suggests something different. This is an interesting problem. Please provide as much feedback as you can, be detailed, leave nothing out.
