Hi, Bren, and welcome. I'm not experienced enough to be a big help, but when my CAG does that really loud sound it is usually because something is bothering her.  Today it was the radio and she stopped as soon as I lowered the volume.  Before it was the vacuum cleaner.  Others have said it is important to ignore the behavior, maybe even needing to use ear plugs!  Keep us posted, please.:ohmy: