ITunes changes my playing song, creates a remote playlist automatically, and volume ups and downs?

Question

Any one can help?

Answer 1

Well, I'm stumped (for now!).
If you've turned off the Shuffle feature, then the Skip when shuffling cannot be a problem, so we've successfully eliminated that as the issue. (For your information, this feature is set for each song; highlight a song and select right-click/Get Info/Options>Skip when shuffling.)
Let's start from scratch.
Close iTunes, and then re-start it.
Select (but do not start) one of your Playlists. It should look like this, The Now Playing area should be blank, apart from the Apple logo.:
I'm looking at my Playlist, named Radio Ultima. The Now Playing area is empty. Note that the first song in my Playlist is Masar.
Click on the Play icon. The first song in your Playlist should start playing.
You should now have a screen similar to this. Sure enough, the song Masar is now playing in my iTunes. Note that neither the Shuffle nor the Repeat icons are blue, so they're switched off. Don't touch them.
Click on the List icon (ringed in red in my screenshot) and you should see a list similar to mine:
The first song in that drop-down list is second in the main window. It will play next. Do not select the Clear button, it will empty the "Play Next" list, which we don't want to do.
When Masar finishes playing, the Now Playing window changes, to look like this:
The Next Up song from the drop-down menu is now playing. In my screenshot, you'll notice that the song Masar has disappeared. This is because this particular Playlist removes songs after they have been played. In your view, the first song should still be visible.
If this doesn't happen, at what point do you see anything different to my screenshots?
As I'm writing this, I have had another idea, but let's look at the results of this experiment first.