maybe motor is going to need brushes soon. com could be all scared up causing to many amp with other batteries...or esc can't handle the other batteries...
.it is having a over heating issue. and this is no larger dollar rc.its a TOY...suggesting the person buy new electronics is a poor choice . he can buy a NIB replacement and have the parts from old to replace broken stuff when he smashes it
On to listen to the Lions on radio..