This is something I've noticed too with my GTB. I can have a good amount of drag brake one day then no drag brake at all the next day. And when I have no drag brakes the brakes on the car aren't that great. If I change my drag brake setting then its fine for a while. This has happened with both my Spketrum DX3.0 radio and reciever and my Futaba 3PK and Fasst reciever.