hrm... actually your problem isn't really a problem at all. It just means that the ESC is giving as many amps to the motor as it will take. About not lifting off the ground, there are several things that coulc cause that. Check your battery and make sure that it is full, or 12.4 to 12.6 volts. If that's not it and you can't see anything wrong with the setup (mainly blade pitches, or say the motor is too tight on the main gear), then the next thing would be to find out what you did between when it was working, and now when it is not?