i purchased a spectrum system for my m-8 used and installed into my buggy and all of a sudden i would get a runawy and then would shut down and i could not steer or throttle just dead '''' of course this was after i hit a wall or something '''' if i turned esc off and back on it would work for a while, switched the reciever thinking i had a bad purchase as it was used, ,,, same thing happened, so next step was to swap the motor with another ""brushed motor === never know""" same thing no difference at all, so i switched esc's novak gt-7 with another out of my truck, same thing again i was at a loss so i asked one of the local guys that is by far more intelligent with this stuff than i and he stated " only thing left is servo and besides had the same thing happen to ne couple a weeks ago, swap that out it will be fine" == ok swapped out servo and tada problem solved servo never had a problem with other reciever which was not spektrum even tried servo in another radio set up again and it seems to work fine, but it caused a problem with the spektrum system.