Intermitent glitching?

[GO-RIDE.com]

The last two times I’ve driven my RX8 esc/motor combo I’ve had some weird glitching while driving, but not when bench testing.

The two things I’ve notice are:
1. Definitely the steering can be intermittent. Originally I assumed it was a bad servo, but on the bench it performs just fine. I checked that the steering system was performing correctly and undamaged. I also cleaned the connectors on my radio receiver.
2. At times it seems to have a motor glitch. It will just randomly surge, but only for a moment. It doesn’t happen often. I checked all the motor and battery connections and they all look and feel solid.

At first I thought it was a servo or radio issue, but now I’m wondering if I have a board with a “cold solder” issue. Our track has a lot of rough landings. I’m now thinking that the power to the radio/servo is glitching from the ESC.

Any ideas?