My S85 seems to have difficulties regularly communicating my new Hormann Garage Door. The supplier of the door initially installed (a now) obsolete code converter, the signal from which my S85 regularly failed to connect, this I understand was due to Hormann uprating their security from 12 to 24 digit encryption. So I had to research this only to discover I needed a 'Chamberlain Universal 2 Channel Receiver Model 8002' this apparently converts the signal back to 12 digit encryption so the Homelink system in the car will talk to the Hormann door. However it's 'Flaky' at best! Up to 50% of the number of times it's supposed to 'AUTOMATICALLY' either open or close the door it fails. I need to keep manually keying the icon on the screen to get it to function! So in order to improve the car signal to aerial/ antenna communication, I've brought in a radio comms. technician who's recommended extending the aerial connection by use of an external aerial which I had installed for about a month. The result of a first class external aerial installation via screened coaxial cable is disappointing. We've now exhausted all feasible possibilities on improving the signal communications. As a result both he & I have now concluded the signal from the Tesla is weak or insufficient. Any suggestions on solving this intermittent problem would be much appreciated?