This is happening to me with Blanket, a software I’m collaborating in, on Manjaro MATE.
Here is the issue with all explanations:
I tested whether this was a MATE issue, but seems that no, because it works well in Mint MATE. So I think this could be a problem with the sound management on Manjaro.
Could someone test if this also happens to them?
Blanket is easily instalable via AUR, package name