This seems to be the most recent Homelink discussion thread of several, so I'll bring it back to life.
I've had zero problems with Homelink until today. My wife absolutely could not get it to open our door, no matter what she tried. After 5 minutes of trying, she called me and I went out to the garage and pressed the button to let her in. We left an hour later together, and of course it worked when I pressed the button to close the door behind me. Returned home and it worked for me again to open the door.
Two more hours passed and I was headed back out and could not get the button to close the door. I didn't have 5 minutes to spare, so I called the house and had someone close the door for me. When I came back home tonight, nothing I tried got the door to open. I've usually been able to get the door to open 100% of the time from a spot at the end of our driveway as I turn around to back in to our garage. Not tonight. Not at any distance. Not even after I stepped out of the car and opened the door with an external keypad and parked in the garage could I get the Homelink to communicate with the opener.
Rebooting the center screen didn't help. I haven't changed any lightbulbs anywhere near the garage in several weeks, and haven't changed the bulb in the opener since before we bought our Model S. Any ideas other than trying some sort of range extender? I'd really like to know why it suddenly stopped, as a range extender wouldn't seem to be all that useful if I can't even get the door to open if I'm parked under the door operator right now.