Timox
I used to have the same problems with my pan cars equipped with Novak Brushless. My Yokomo SD TC also suffered but it was very seldom. The problem is serious at this huge track in kelang. There are two lamp posts there and i have seen many EP and Nitro cars crashing there. I broke mine too and struggled to find solutions. I have tried all kinds of solutions to minimize noise and interference and none worked until I bought Spektrum.
Once I upgraded to Spektrum, I no longer had any glitch of any kind. My guess is, Novak brushless system emits more noise and interference if compared to V2 or conventional brush motors. The only cure so far is by not using Novak brushless or to simply use Spektrum. You have two options. Hell, Novak brushless is great, i would rather spend money on Spektrum.