not likely, although there has been found to be two different fets in the MM... Joe from CC says there has been no change, and that it's just luck of the draw whether it works fine or not.
Jammin CRT MM/Neu 1515 1700kv
Losi 8IGHT MM/Neu 1512 1900kv
Kyosho 777
T4 MM 5700
B4 LRP
XX4 MM 7700
old losi xxcr, MM4600 4s lipo 70mph+