Have been using ratgdo devices (ESPHome firmware) on 3 Liftmaster 8550 garage door openers with 880LM wall openers for some time without any issues. Recently, 2 of the doors will spontaneously lockout the remotes, and even if I disable the remote lockout in the 880 LM, the lockout mode will re-appear within a few hours. I did change out one of the 880LM wall openers but problem persists. The Liftmaster/Chamberlain support staff are clueless. Attached are the ratgdo logs for 2 garage doors, one which is not experiencing the lockout ("...C499") and the other door that is ("...3159"). Any ideas?

I seem to be experiencing this same symptom now. As a test, I have disconnected my 880LM completely and will see what happens.

Did you ever track down a diagnosis or solution @SHM ?

I changed the wiring into the motor such that there was only 1 wire coming out of the lift master 8550 red (control) and white terminals, then those wires split to a Y and the garage wall remote and ratgdo wires insert in to the appropriate sides of the Y. My observation was that doubling the red and white wires from the remote and ratgdo and then inserting them in to the lift master terminal never gave a motionless connection. When the garage door opened, there was enough vibration to momentarily have either of those wires to loose contact, hence the door would stop. Haven't had a problem since.

In my case, I already had a single wire into the Liftmaster, from the Ratdgo. the 880LM was wired into the Ratdgo in pass through mode.

My problem was false, spontaneous "lock" signals. This was confirmed because the 800LM would display "locked." The question is whether the spurious lock signal came from the 880LM, which is 12 years old, or the ratdgo itself.

I disconnected the 880LM completely. At this point, I only have the ratdgo and wireless remotes communicating with my Liftmaster. It's been four days and I have not had a recurrence of the problem.

My plan for now is to live with only wireless remotes plus the ratdgo. It that proves to be a problem, I'll install a new wired controller in pass through mode to the ratdgo. I am tossing the old 880LM.

I am also trying to add the ratdgo "lock" control to my Home Assistant instance, but am having some difficulty. I can see the control in the ratdgo ESPHome instance and control it from my HA dashboard, but when I add it to HomeKit, it does not appear in HomeKit.