This is definitely the update what’s causing the problem. I had the basic box which was brilliant for years. Then before the update now tv was loading slowly and and not loading etc. I thought it was the box. So bought the new ish 4K box last October and was fine till the update. Now tv still taking ages to load and if I choose a channel to watch it flicks on then completely shuts my tv down and the roku box resets. I have to keep trying it till it stays on. I’ve changed the hdmi to another and it still happens and my tv fairly new ish. This is roku update and they need to sort it. I’ve got good wifi too.
I am having the same problem. I had a working Roku express unit but wanted to upgrade to have better screen mirroring on this particular device so I bought a Roku express 4K. As far as I know I installed it correctly and have checked all the cables and ports. Every half an hour or so, the streaming cuts out and I get a “no video” message; shortly afterward the tv shuts off. I have restarted the Roku, unplugged and re-plugged in the Roku and the TV, and none of that has worked. I have not yet done the factory reset. My Roku unit is only about a week old.
I am experiencing the same issue. My Roku Express 4K+ started to shut down on its own today. It's been almost a year since I purchased this device with no issue.
I already restarted the box, used a plug to directly power the box instead of USB to TV, I removed the power saver, I unplugged the power to the box for an hour, I checked the software updates, and with all of that troubleshooting my Roku Express 4K+ still shuts down after 6 to 20 minutes the Roku box shuts down. My only guess now is the latest update. Can someone from Roku answer our questions and concerns here?
If @Lisone's suggestion didn't resolve the issue you're experiencing, please reply here with the serial number of the affected Roku device. It can be found in Settings > System > About. I'll be able to further assist you from there.