Need help with my Reflex 14T

So I have this 14T with the XP120 radio and XP-R4 receiver. I’ve had it for a couple months now, and since I’ve gotten it, it’s had a problem with full throttle taking off on it’s own, and not properly communicating with the radio. I dont have a lot of experience with technical sides of these guys, I’m a bit better at replacing the hardware haha. Anyways, any help or suggestions are welcome, but if it comes down to it, I might just get a new radio setup…