I wasn’t pushing the buttons though. It was happening during the night while everyone was asleep. (Unless a mouse ran across the key fob or something-)
One common cause of that is a low battery in the fob. I replaced mine and my mysterious door-openings stopped.
some fancier ones had battery protection, if it got to low it would start.
others had temp sensors and would start once in a while when it got really cold.
likely one of those two options setup in it.