Player (almost) locked when playlist finishes

[il_mix]

Hi, everyone!

I'm new to the forum and RockBox.
I've just bought a Sansa Fuze Plus, and installed RockBox almost immediately.
Everything looks fine at the moment, except for one thing. When I start playback within a database folder (e.g. an album), we can say that a temporary playlist with all the songs in the folder is created and played. When this "playlist" terminates, I can't control the player no more. The only buttons working are the power button (to exit screen saver and turn off the player) and the volume buttons (I see volume changes wen pressing them). All other buttons (play, back, up/down/left/right) do nothing. I have to turn off/turn on the player to be able to use it again.
The player is not completely locked, so maybe I'm missing something obvious regarding RockBox controls...
Any hints?

Many thanks!

[Bilgus]

Check that you don't have Advanced Key Lock Active
https://download.rockbox.org/daily/manual/rockbox-sansafuzeplus/rockbox-buildch8.html#x10-1500008.5.7

[il_mix]

Advanced Key Lock Mode was disabled. But it seems than enabling it fixed the problem. I have to do some further testing. And better understand what Advanced Key Lock Mode is... (just tested enable/disable for the subject issue).
In the meanwhile, thanks for the hint!