I know the meme format is kinda wrong. It’s also kinda right.
It might be your phone getting a notification, and sending that to the BT speaker, which then takes precedent over the laptop
I usually just disable BT on my phone when stuff like that happens (on android, you can change the playback device without disconnecting, and that should also prevent the phone from stealing your headphones)
There might be something to that. Unfortunately I keep Bluetooth on for my smart watch to connect. The headphones aren’t normally selected, but I think they auto-connect sometimes when they come in range. It also doesn’t help that the main way of switching the connected device is via the Android app, that requires the phone to use. (Original Surface Headphones, I’m considering replacing them because the pads are falling apart already)
(on android, you can change the playback device without disconnecting, and that should also prevent the phone from stealing your headphones)
You can do this quite easily on iPhone as well, I was delighted to discover when my beloved OnePlus 7T Pro died and I went to the Dark Side.