Don’t pair and connect at the same time, that kills this speaker especially with Linux.
It is not multiconnect, and it accidentally tries it and does it badly.
The speaker connects to both then its basically very unreliable. If you insist on pairing to two devices, then turn bluetooth off / on as you swap. It’s the worst of all Anker products I’ve found for this paired-twice issue.
I get more reliability pairing between two Android devices, they seem to tolerate each other but anything paired with Linux but not be paired with anything else, if you want to not have to re-pair then just disable bluetooth on other device.
I’ve got my Motion+ most reliable with my Linux by resetting and deleting all pairings other than with the Linux laptop. I got my Motion+ for free gift from Soundcore so I’m not complaining, just observing if you bought it I’d return for refund and get different product, I don’t think the problem is going to be fixed, it’s a pretty mature model and if its fixable they’d have done it by now.