Today, I had the same problem. I didn't wait but I tightened the throttle stick with full force. Beeps were resolved. This is strange bevaviour of my stick:
It has been from I have bought this TX. When I have set a throttle range in ESC (some time ago), I have been tightened this stick with full force, too. But when I always turn on ESC this stick is on second "teeth". I had this problem before first flight (before second everything was OK) and it was quite cold outdoor. Is this normal? Is my potentiometer broken?