Spiced, I think the servo and Rx wires were twisted like you say on a Futaba radio set that I had many years ago. I will have to try this idea the next time I have a glitch problem.
I had a glitch problem with a previously stable plane set up awhile back. (This was a well known name brand unit) I just could not get it to stop glitching while running tests in my garage. I finally found that the floresent lighting was causing the problem. Boy did I feel stupid! Some people use a cheap DC powered AM/FM radio as a test for interference before they fly. (I plan on trying this myself in the near future) I also had a case which was only solved by switching the Tx to a known good name brand unit. Beware of inexpensive RTF systems as they sometimes have recvr, servo, and or ant. wires zip tied to the batt/motor wires. I have even seen ant wires wrapped around steel control rods, etc. (I try to run all ant. wires outside of the fus. as much as possible.)
It is also a good idea to wear a wrist ground strap while working with electronics such as servos, Tx, Rx, antennas, etc. I have seen more than a few PC motherboards ruined by elec. static discharge. I rub the carpet and cloth seat covers in my vehicles and work shop with a dryer sheet so as to reduce static elec. build up. This can help reduce the possible damage to your electronic devices by ESD.