Sorry - I didn't realize the setting was per viewing device and used the pixel to turn it. I enabled it on the TV and just had a crash at 10:27pm Eastern.

HDHomeRun FLEX 4K firmware version 20250815, device id 10A4BCDB
onn 4K streaming device, Android TV OS build UR01.250103.029.C1.13655754
HDHomeRun app version 20250708

While watching live TV the picture will suddenly stop, the audio stutters for a second or two and the onn device crashes and ...

Thank you Jason. Can confirm that this is the issue. I borrowed another Roku and it works fine.

Switching to 720p vs 1080p does not effect the size of the picture. Some stations have even smaller pictures and a couple look normal. I moved the Roku to another television and it does the same thing in the HD HomeRun app. Netflix, Hulu, etc all work fine too.

Example image:

There is one channel that displays full screen, most other channels are about 75% and one is 25% of the screen. I sent diagnostic data tuning some of the channels about 10 min ago 10A4BCDB in case it is useful.

Using HDHomeRun FLEX 4K (firmware version 20250815) on a Roku 3800X streaming stick sw version 14.6 with the HD HomeRun app version 104.0 build 20250817. Tuning many ATSC 1.0 stations the video appears in a box in the upper left corner of the screen with the rest of the screen a solid green ...