Ok, I have a LMH 120 helicopter. When I am flying for like 1:30 minutes+ it will just drop out of the air. And if the throttle is held in one postion at 30% or below for more than ten seconds the blades shut off. I am using a 17turn Atomic force modor and a 25amp sprite ESC. I have anderson battery connectors and a 8cell 3300 battery. The brushes in the modor are brand new. In fact the modor is brand new. I replaced the old one thinking it was the problem. The problem has since improved but still exists. Could it be my ESC? Do anyone have a answer to my problem?

There is a forum dedicated to LMH here.
You should check there. I seem to remember the 120 required a much bigger ESC then 25amp. Maybe I got the model # wrong but defintely check the LMH forum.