Sound drops out during quiet moments

[DuaneB]

I had a 55" Vizio which was connected to a Vizio soundbar. I had a DirecTV receiver hooked into HDMI 1 and a Phillips blu-ray player in HDMI 2. I recently upgraded to a 58" 4K Vizio and left everything hooked up as is on the new TV. The DirecTV receiver and whatever I am streaming on works perfectly soundwise, but when I watch a blu-ray, the sound cuts out during quiet moments of a movie, especially between dialogue, somerimes even cutting out low background music as well. I have tried every setting I can think of, but nothing helps. It doesn't cut out as bad if I turn off the soundbar and use the TV speakers. I tried switching the blu-ray player to HDMI 3, but it did no good. I already bought a new high speed HDMI cable to see if that would fix it, but it did not. The soundbar is old, but it works perfectly if I am streaming or watching DirectTV. Any thoughts would be appreciated.