I figured out today that if I exit the HDHR app on the Google TV, the 404 error does not occur. In other words, it seems that leaving the app running in the background is what can randomly cause the 404 error when returning to the app, which then requires going into the TV settings and force ...

Please see my 3/30 update to my original post.

I turn on the TV and try to open the HDHR app. I haven't been able to determine any other conditions or sequence of events that will cause the error.

Since a week or two ago (started around 3/15/26), when I try to open the HDHomeRun app, I have occasionally gotten a '404 Not Found' error in the upper left corner of an otherwise black screen on my TCL Google TV. When it happens, I have tried switching to another app like AppleTV and then back to ...