Ditto. Same complaint. Acorn help is useless. Roku … nothing resolve. Like you, we have a Samsung tv and a Roku sound bar. When I contacted Acorn, they want so much info, and they have no idea. Then they want video of it crashing. Nothing. Then Roku gives you the ‘standard’ answers. I laugh.
bUT….. someone said change your Roku settings. Hmmmm. We did. And it fixed it… so far. So it’s a Roku bar, Acorn mismatch with Acorn programs.
THIS WORKS ON OURS: Roku settings, DISPLAY SETTINGS, 4K HDR 60fps TV.