Peacock streaming problem with resolution

My system has been working properly since I subscribed to Xfinity about 4 years ago. I’m using their XG1v4 DVR. No changes have been made since then.

However when watching a Peacock program two days ago the screen when black but still had audio. A message on the screen said “Mode Not Supported, Resolution not supported…”

Pressing any button on the Xfinity remote did nothing. I unplugged the DVR from power, waited awhile & plugged back in. It rebooted & worked again.

Did some searching & it appears the screen message is generated from the Samsung TV when it receives an incorrect signal. However everyone that had a problem had it from the start, IOW when first connecting a device to the TV something was not configured properly.

I never have a problem watching live TV or doing other on demand streaming, and that includes today.

I’m presuming Xfinity is somehow corrupting Peacock & perhaps other streaming sources. Anyone else have this problem?