Voice loop when entering multiplayer

Hello,

I'm new to Minecraft. Please accept my apologies if this bug isn't related to he Launcher as I'm not really sure.

When my kids join a multiplayer server, we have this really annoying voice played in loop:

I have recorded a screencast showing the bug:

https://drive.google.com/file/d/13UIgLBTmKiQsGW6BQwduXdEtD4o25mgo/view?usp=sharing

 

Best regards.