Non-Facebook Messenger Clients Not Updating

I try to use separate apps for Facebook Messenger, and I’ve tried both Goofy and Franz. When I have them open, they seem to work fine for a short period of time, then they drop all my messages on the floor until I quit and restart them.

This is on Mojave with the latest updates.

Anybody have a similar issue? Even better, maybe a working alternative?

It sucks to have a (theoretically) perfectly-functional app open that just isn’t receiving the updates.