Ok I have a problem, hoping for some advice. I have a Tekno 4x4, tekin rx-8 and 4300hd motor, 7200 70c battery running bullet connectors right from esc. I am having issues with black/neg lead unsoldering itself from the bullet lead from esc, right at the bullet. I have turned current limit down to 50%, thought that helped, but after 3 pushed qualies, 2min into main pop, and it was barely 70degrees here in Michigan yesterday.

Sorry for length, and advice is appreciated.