[Vex] Spontaneous channel switching/dying

[Joe G.]

We are having an unusual problem with our vex elevation robot. Controls from Rx1 work fine. However, for about one boot out of every four, about 30 seconds after teleoperated mode begins, signals from Rx2 begin to undergo a bizarre, repeated, pattern:

Channel 5 (controlling motors 5 and 6) does not work
Channel 4 (controlling motor 7) instead controls motor 8
Channel 3 (controlling motor 8) does not work.

After about 45 seconds of this, the robot returns to normal.

Rx2 Light remains on at all times, and no code error light flashes

This problem has never occured under tether, but its occurence is inconsistent enough that i could believe that this is a coincidence

Any suggestions as to why this might be/how to solve it?