i have a wild dagger with the 550's and the evx.so to day im driving it and all of a sudden it just stops working.the steering still works but the motors wont go.so i shut it off and make sure everything is still connected.and it was so i turn it back on 3 minutes later and it works but then the same thing happened.im not sure what the problem is.but im pretty sure its the evx.what do you think?and what should i do.

Usually when that happens to any of mine it's a bad connection somewhere. Either a battery bar solder joint or a connector. If you changed out the plugs, check the solder joints where you soldered the new connector on.