Help Popping Speaker Icon and sound

[Gertjan17]

Dear heroes,

I got a new HTC One M8 and discovered an irritating problem.
Every half hour or sometimes faster, a grey box with a speaker icon appears. This also comes with a short beep sound.

I don't know what to do. Does anyone else got this problem?

Picture attached.

Regards,
Gertjan

 

[vosg]

What happens when you click on it?

 

[Shantanu394]

I m too, frustated from this problem
Cant format my phone !!!!