Audio file from nowhere starts playing with all services disabled

[francwalter]

Hallo

I have since some weeks a very weird issue: on my old MacBook from Mid 2009 with OS 10.15.7 (patched) I have Ferdium 6.7.4 running and sometimes audio files from nowhere are starting to play and loop.

I have several services (WhatsApp, Telegram, Google Keep, Discord, Google Calendar, IRCCloud and some Website services) and sometimes, without any user interaction, weird audio clips are playing. They play in auto-repeat and I dont see from where its coming.
The audios are mostly german, but also english (american english). Could be some youtube clips (in one audio sombody said: "...write it into the comments...").

First I didnt notice where it was coming from, no app running audio on my MacBook, but I found out, when I close Ferdium, the audio stops immediately, so it is related to Ferdium.
So I started to disable one service after the other, but the audio continues with all services disabled. Only when I close Ferdium completely.

A while I thought WhatsApp (and maybe some weird contact of mine) could have be the culprit, but I am not anymore sure.
If I disable WhatsApp service the audio continues, but maybe Ferdium is caching them and continues play them even the service is disabled.

Does anybody know what it could be?
Is there any setting to disable any auto play in any service?
Thank
frank

OK then, I started an issue about it.