Hey Rob, sorry to hear about the probs.
First off, I dont have any answers sorry.
However, your last question of is it possible that the 2.4 spectrum is filling up then definately yes.
This is something I was talking over with some other racers recently.
Literally everything and his dog seem to use 2.4 now (controllers, Internet routers, computers, phones, even bloody doorbells!!)
Its becoming a very congested spectrum now.
Absolutely no idea if this is the cause of your problems though. Sorry.
Couple of points of interest (well, interesting if youre a geek like me
)
- 5.8Ghz transmitters/receivers are now coming to market and will (I believe) become the norm over the next lot of years;
- Despite what it says on the packaging, no 2.4 systems that I know of are true "frequency hoppers". That is, that despite being FHSS, they can still be blocked if enough of the used channels are conflicted by other 2.4 systems. True FHSS would make this very unlikely to happen in my opinion.
Sorry I cant be of more use, but it could be as you say, that the 2.4 spectrum is just full up.
(take a laptop and a software oscilliscope program to the next meeting to view the 2.4 spectrum - you'll see if its full or not) - might be worth a try?