What channel are you on? some of the low channels, CH11 is one, are close to some paging towers. If you have access to a frequency anylizer, check the air when you are having the glitching to see if there is blead over from one of these towers. The little Hobico frequency checkers will not give you a good picture.

I took our clubs anylizer to Savannah in Oct when I went out to visit my son. I had been incomunications with one of the guys on this forum and he was complaining of "hits". The day I was at their field, there was a very strong signal right next to Ch11. Any fuzz on the transmitter would easilly blead off into the CH 11 frequency. The other interesting thing at that field was that when two Tx's were on there was a lot of noise around both frequencys. Their field in on an old dump site and there is a lot of burried ReBar just below the surface and this screws up things at ground level.

All that aside, now that it building season, it might be a good idea to send your RX in for a checkup.

Like the other thread was saying, check for metal to metal on all of the servo linkages. I had one plane two years back the if the engine was running and I touched a screwdriver to the idle mix screw the servos went nuts. It was very repeatable once I figured out what was kicking it off.

Thinking back, even a loose clevis on a metal pushrod might be enough to introduce some RF noise.

Good luck in tracing it down.

Don