[Waiting on Partner] Background play no longer showing on YouTube TV

I have two recently purchased Roku BRAND televisions.  Not other brand televisions with the Roku app preinstalled on them.  Genuine Roku.  Really, really like them.  One is a 32" and the other is a 55".  

I use YouTube TV as my primary streaming provider.  Note that this issue only happens with my 32", not my 55".  So here's the setup.  I'm watching a channel and decide to browse through other live options or recorded ones. So using my Roku remote, I press on the "arrow pointing left" button on the top left of the remote.  In the past, the television would keep the audio of the channel I had been watching while I browse for options.  But as of a couple of months ago, the audio goes away completely and I have silence until I choose a channel option and everything is right again with the world! 

I checked all settings and couldn't find anything that may help me with this so I used the nuclear option and performed a "factory reset" of the television to out of the box state.  Set up everything and when I first tried it, IT WORKED!  It now held the audio of the prior channel while I was browsing! It's fixed!  Well that joy was short lived as it only worked one time.  The next time I tried it, it was back to its old tricks of silence while searching.   Both of my Roku TVs are up to date with software.  

While I certainly can live with it, I'd sure like it to go back to keeping audio of prior channel on when browsing.  Any ideas?  I'm kind of stumped as to why there would be any difference between my 32" and my 55"  I looked for known issues and couldn't find anything.  Any ideas?  Thanks in advance!