Tekin fxr problems

[DTA510]

Just put my FXR in my SCX10 throttle has a huge Dead Zone increase very slow when throttle is released to neutral it continues to roll until breaks are applied with push control low and drag brake on and other times it's perfectly fine after about 4 or5 minutes of driving it will work great then give me a low battery indicating and will not move only servo, kinda acting like I don't have a external bec but I do,I'm running 3s 2100mah 20c.could this be poor signal to the transmitter? I seen that my receiver case had come apart so that's what leads me to hope and think it's a poor signal, cuz I'll just by a flysky n be back on the dusty trail!