Quick update: I have switched to the other adapter (the one with the 'proper' antenna) -- the problem still occurs.
When connected, I see dBm values <50 (which is an improvement), but the connection still drops frequently and is really unreliable.
Hi, that could be because of the "unstable" wifi source. Maybe one of your neighbor use the same wifi channel, you did a channel analysis to see the interferences? The possible existent connman-iwd issue I think appear at reconnecting. But even without the "reconnection issue", an unstable network and continuous streaming isn't the best option. I'm just wondering... that part of the stable/unstable wifi network could be the reason that only a few users reported this issue...