That's a good thing to investigate. I did make a list of the channels I deleted.
Last night I noticed "scrambled programs" 89.1, 89.3, and 89.5. In addition, 89.4 was back - according to my notes I pared it off manually.
After reading your response, I decided to see if any other of the blank "scrambled programs" had populated. As expected, a few more had appeared. They are:
89.7, 89.9, 89.10, 89.11, 89.12
Of these, 89.7 is the only channel which, according to my notes, I manually removed. It may have been a shopping network, but whatever it was, I did not want it.
Now, I hope I'm not confusing you, but I'd like to point two channels within the sequence which DID NOT reappear as annoying "scrambled program" channels: according to my notes, 89.6 and 89.8 had programming on them when I scanned to tune, and then I manually removed them. They did NOT reappear as zombie "scrambled programming" channels, while others just around them did.
Since sitting down and flipping from channel to channel, I've come to understand my annoyance at these channels better. I've noticed that my TV takes an extra second or two to determine that the channel is in fact "scrambled programming." When these null zombies re-appear it's not the same as just flipping from channel to channel. Waiting longer to see nothing is not what I'm about when I set down to view the telly. Since these beasts appear in sets and streaks it really is the debbie downer.
As I remember, these zombie stations do not appear mixed in with the majority of the programming. They number in the 80's and upwards from that.
I should probably start from scratch, re-scan, take extra careful notes on what I keep and what I remove, and see what I can notice. I'm also going to fish through the manual for the TV and see if there's a setting relative to this issue.
I wonder if a software update for the TV itself might solve the problem by increasing the number of Favorites I can have on the Favorites list.