I have a Roku Ultra (4660, 4661, 4662 series) in my family room that's about a year old. It's connected to my Samsu TV via a 4K HDMI. Everything I watch on the Roku looks great and plays back error free: Apple+, Prime, Hulu, Paramount+. But when I select Netflix, my TV says there is no signal, then after 20 seconds, shows the menu, then after a few seconds, shows no signal again. I've tried to repair (reboot) the channel in Roku, but that doesn't work. When I removed it and added it again, I get the funky barcode to scan and that takes my info from my phone, but then the picture immediately disappears again. I tried all the above after soft rebooting the Roku and unplugging/plugging it, but the problem persists. Netflix works fine on my other Roku Ultras in the house. It's just the one in the family room where this happens. Any ideas?
After removing a channel, best practice is to restart your Roku to clear its memory cache before reinstalling the channel. Without the restart you may not get a clean reinstall.
Depending on your Roku model and Roku version number you'll find the System restart option under either Settings > System > Power or under Settings > System. If you don't have sufficient control to use the menus, or if it is just more convenient, you can also restart by pulling the power plug for a short while, then plugging it back in.
Thanks! I tried that and the problem persists. Any other ideas?