Recently, my QLED TV has been automatically switching from my antenna channel to Samsung TV Plus. It happens 90% of the time (but not 100%), when I turn off the TV and then on again, or if I spend time in a streaming app, then exit from the streaming app. I've never seen it happen while I'm actively watching the antenna channel. Because this never happened for the first year or so that I had the TV, I'm guessing that it's associated with a software update, which must have occurred in early May 2023.

Is there any way to keep the Broadcast Source tuned to my favorite antenna channel, and stop this switch to Samsung TV Plus?  I'm not saying that I want to permanently eradicate Samsung TV Plus -- I just don't want to be forced to watch it.

Two Samsung "Pro"s two different solutions: one asked me to try a "cold boot", which didn't help at all. The other asked me to unplug the TV, wait a few seconds, then plug it in again. This worked once, and only once. After that, the undesirable behavior returned.