I also have XM4's and they worked fine on Arch after addressing two problems:

Do you dual boot? Different OS's on the same computer will generate different pairing keys even though they share the same MAC, and this will cause connection issues. Usually that's reported as having to re-pair every time you switch OS's though.

https://unix.stackexchange.com/questions/255509/bluetooth-pa...

I've also experienced audio skipping & popping using a dual WiFi/Bluetooth card that were eliminated by disabling WiFi. Apparently the Linux driver was faulty and allowed some interference; the card worked fine on Windows.