Since coming back from holidays where tv was unplugged for a few weeks, all my channels are down twice in the guide. I can't use remote down button to go through it. I've tried installing all channels again to no avail. Anybody know about this error before I reset the TV. It's a Sony KD-65x8509c with latest update
Same thing happened to me too. I've solved by reordering the channel list with SDBEditor, you can use SonyEditor too. The latter one is official but i like the other one better.
Just try to put one channel into number 1 and reorder it. You can export and import the channel list from digital setup.
SDBEditor, forum is in Russian but the program is english, https://4pda.ru/forum/index.php?showtopic=731708
Edit: Put the last channel into number 1, been a while since I've done it. But it saved me from resetting the TV.