Popping and crackling from Directv app

I am getting a popping and crackling comming from the directv app, only intermitently, but once it starts I have to either change the channel or rewind to make it go away.  The Directv is streaming from a Roku Ultra > home theater reciever > LG oled TV.  The speaker crackle/pop starts out of ALL speakers (not just one that would indicate wiring), and ONLY happens when using the Directv APP...it does not occur with plex, amazon prime, netflix, etc.....  Receiver is Onkyo 7.1 channel, speakers are KEF 6ohm.  Not that it should matter, but Stream box is hardwired and running 1gig service.

1)I have tried different Roku boxes on home theater, they all will crackle, but only on this system.  

2)I have tried 3 different sets of HDMI cables

3)Have rechecked all wiring connections

4)set connections to "dolby" (just in case)

5) finally and the most expensive, replaced the amp....still crackle.

Any ideas?  Once again it only happens intermitently, maybe once or twice a day....some times not for days, other times 3-5 times in one day.  Seems like it happens more when going to commercial, but on rarity in the middle of a tv show.

I am at a loss for ideas.

Thanks,

Pete