Reception, channel detection, network issues, CableCARD setup, etc.
Jumping in here late, but I just installed a Flex 4k and it works with every device in the house except for a Roku stick (3600x) plugged into a Panasonic TGH-50PX77U, which does support Dolby Digital. Picture is fine, but no sound. Tried every combination of HDMI and Audio setting on the Roku, but still no sound. Any more suggestions other than what is posted above?