I have a stock G&G GR16 (EBB M4), it's been running solid ever since I've had it. (Battery: 9.6v 1600mah) One eveing I was shooting it off my back porch into the would to re-adjust my hop up. I noticed the motor grip was warm so I decided to give it  a rest. Temperature Outside: 55 +/-; shooting for about 10 minutes, not consecutively. The next day I want to my friend's house to do some 1v1 in the woods when I noticed my motor was warm again and I could faintly smell a burning smell. I immediately put it on safety and took out the battery and mag. Later on I ran the motor out of the grip and it seemed fine. I'm not sure if this problem will go away over time or I need a new motor. It's fine if I need a new motor, I just want to know whether I can keep using my current motor without damaging other parts. Also, would I need to re-shim my gearbox eith the new motor? I plan on getting the Lonex A1 Titan.