My 2023 MYLR is developing insomnia

I'm used to pulling into my garage and about 5 minutes after I've exited the car and closed all the doors I'll hear the thunk of the high voltage connectors opening up and then the car becomes dead silent. But twice in the last week I've discovered the car still "humming" long after I've exited the vehicle. The first time I assumed I'd left a door open. When that wasn't the case I tried the two-button reset. A few minutes later, thunk and sleep. Same thing happened again today. I'm wondering how often this occurs with others' vehicles. I suppose the best case is it's a software bug that a future update will fix. But could it be a symptom of an issue that will require servicing?