What is the FRM menu for on the DX3.0, its in the MDL section, choice is N or F it's not in the manual, and I am not sure it was in there before I sent in the radio for repair.

The radio also now makes my servos go full lock once the transmitter is off but reciever is on, which is annoying and might be bad for the servos, any idea on that?
(yes recievers have been re-bound a few times since)