Pull the plug and check to see if it's fouled really bad. This has been known to cause a problem now and then. Not very often, but has. Check that the plug is tightly assembled and that the insualtor hasn't been cracked somehow. It could still fire this way, but will radiate.

Are you using any mylar type of tape to hold the antenna down anywhere on your planes? If so, get rid of it. Several times I have seen terrible and so-so range checks become stellar just by removing that type of tape. It's the clear packing type of tape.

Take all your extensions and one by one wiggle them to see if you get any bounces in a servo with the radio turned on. Again, use a standard receiver, not a PCM. Check to see that all the plug ends are clean and tight. Make sure you don't have any wires that have started to pull out of the servos or the connectors. If you can get your hands on one, use a H-9 servo amp and volt meter to check the voltage draws on each servo at neutral and under load. A digital servo going bad will often spike the receiver. Any servo showing a lot higher amp draw than all the others should be suspect.

Do you have any aileron extensions that get plugged and unplugged often? Check them very closely. I lost an Ultimate when two aileron wires shorted out because each time they were plugged in they were cut just a tiny bit on the edge of a nylon wire tie. The result was inevitable, it was just a matter on when.

Now go back and check all the nuts, bolts, cables, etc. to be sure they are tight. If you are using carbon fiber pushrods, ane any of them rubbing together? If so it will be a very bad thing. If the switches are old or have been around in use a long time, replace them. It's cheap insurance. What is the condition of the ignition battery? Is it new and holding a full charge, or is it old and weaker than it used to be?

Get the Bosch cap from CH. It's the best RF insurance for the ignition on the market. I switched to them some time back and they work well. Those that run DA and 3w don't have a choice, their caps have to be ultra good because they can't get a resistor plug. That's one of the reasons for the Bosch style cap on our ignitions.

If you have any other questions, get in touch with TKG. He IS Ch Electronics and ignitions. Bill owns it, but Terry is greatly involved.