AX4200 Router and Satellite - Wifi Devices lose connection for short periods of time

I forgot to add what I have tried so far.

I set the 2.4g channel to 11.

I have also tried setting the radios to 50%.

Lowering the power helped with the TV issue.  I have a wireless HDMI setup to send signal from my audio receiver to my TV.  It also seems to be messing with my Roku remote some.

The house : 1500 sq ft. on top of 1500 sq ft finished basement.  Router is in basement, satellite on main floor.  Probably 35 - 40 ft apart and through a floor.

I already disabled armor.

I am a little frustrated that crazy tweaking and testing over and over might be required to make an expensive plug and play setup to function properly in the most basic way.

I am not really interested in walking a line to make something like this work just right.
I am really looking to see if this is normal, of if I got a dud.  I hate to say, but I might consider returning and going a different route.  I really wanted a triband mesh, but this is getting frustrating.