Thank you for posting your detailed video. My experience is identical to yours.
When parked in my driveway (within 5 or 10 feet of my garage door):
- Garage door is open = Homelink works about 90% of the time.
- Garage door is closed = Homelink works about 10% of the time.
When parked in my garage:
- Homelink works 99% of the time with the door open or closed. However Homelink sometimes purposely skips auto-close after backing out using Summon - not sure why.
Conclusion:
- Homelink's signal is extremely weak. It appears the garage door creates a barrier that prevents Homelink from operating as intended.
- I do not believe stopping the garage door operation while the door is in motion has anything to do with "breaking" Homelink's setup. It is the garage door itself that is preventing the Homelink signal from reaching the garage door receiver.
Workarounds:
- Speed into my driveway so that by the time auto-open triggers, my car is facing my garage door straight on and is close enough to the door. This approach is unsafe and it rarely works anyway.
- Park within inches of my garage door, either straight on, or at a slight angle and then manually press Homelink in the car (usually requires multiple attempts).
- Use my garage door remote since it can operate the door from a much greater distance (100+ feet) even when closed.
I am disappointed with Homelink. It does appear to be somewhat useless due to its inconsistency and unreliability, especially when outside of the garage with the garage door closed.
Garage door unit: Liftmaster 8500 (Jackshaft)