I have a redcat volcano, after it gets warmed up its no longer responsive. The throttle seems like its not working and then it cuts off.

Richen the high speed needle.

Also, here are some tuning videos to help you:

http://youtube.com/watch?v=oSmMzpZM_As
http://youtube.com/watch?v=BJFsJAxNoRg&feature=related

thank you very much

Try checking to see if the throttle lever is getting hung up on the servo. if it is all you have to do is loosen the screw where the lever connects to the diff box, and adjust it up enoughso that it stops getting stuck. This happened to my sv.