Accidental mute all

Our meeting organizer has repeatedly apparently had other participants click "Mute All".  Is this really an option for a random attendee to "Mute All" or is our organizer accidentally doing it to themselves or choosing the incorrect options for starting the meeting.  Often the meeting starts out ok with dozens on the call.  Eventually everything goes silent and we are told it is because someone randomly chose "Mute All".  As you can imaging it has been a frustrating experience.  Thanks in advance!