I have a customer with a 500 runing 4.0.10, they have several Analogue Cordless handsets. occasionally when an incoming call is answered on a cordless they press R and the caller is cut off instead of being held. this is not user error as i have been and tested it and seen it myself. in system status the call just drops. i upgraded it from 4.0.5 but no change, i would guess this happens about 1 in 20 calls. all the analogue control data is set to eng so i dont want to play. any ideas?