All I can tell you is that these settings have been working for me.
I don't recall specifically setting it up this way...must have been a default setup they established.
Main Menu>Guide>Settings>Last viewed state>the Disable has a check mark
My Set Top Box is :
Please note that I never turn off my STB's
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I had the same issue and it turned out it was because my DVR was recording two channels at once while I was away so it had to tune to that channel and then that was the channel I was seeing when I turned on the tv. Might be the same issue for you.
Why bother turning box off?
It doesnt save any electricity.
Lately, I noticed that when I turn on my TV the channel that comes up is 501 FIOS, which I don't like. I contacted Fios Support to get help to NO AVAIL--pathetic!
Luckily, I found a solution, which reverts to the last viewed channel. In other words, when I turn on my TV now the channel that comes up is the LAST VIEWED CHANNEL.
Here's what I did:
Scroll all the way to the bottom to an option called: Last Viewed Guide State and hit OK, then select (check) the DISABLE OPTION and hit OK.
Turn off the tv and then back on. The channel on the screen should be the last one you viewed.
It worked for me. Hopefully it will work for others too.