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FiOS TV Volume Fluctuates

While watching TV the program volume will start to fade to almost inaudible and then gradually increase back to normal levels.  A few minutes may pass and then the cycle repeats.  My setup has a master STB in one room and a "satellite" STB (much smaller) in another room.  This problem occurs on both TVs.  It is not restricted to any specfic channel or content.  This is a fairly recent development, say within the last 2 weeks.  What's going on?

Re: FiOS TV Volume Fluctuates
Super User
Super User

How are stbs configured for sound?

Are they set for fixed or variable?