I did more testing.
I cleared my settings at boot to have default settings. I only enabled auto change directory and disabled repeat (don't know why it is enabled in default). The Bug wasn't there.
Next I enabled directory cache, rebooted and now I get the bug!
Settings different from default:
auto change directory: on
repeat: off
dircache: on
This is the interesting part of the logfdump (read it from bottom up)
the complete log is in the attachment.
Codec failure
Codec load error:-1
Codec load disk
Codec: Unsupported
Postbuffer:3/3
End-of-playlist
Open failed
Open failed
Open failed
Open failed
Open failed
Open failed
Open failed
Open failed
Open failed
Open failed
Buffering track:3/3
Clearing tracks:3/3, 0
Starting buffer fill
Clearing tracks:3/3, 1
Forcing rebuffer
bind: 0//.rockbox/.playlist_c
Check new track buffer
Request new track
Codec failure
Codec load error:-1
Codec load disk
Codec: Unsupported
Postbuffer:2/2
End-of-playlist
Open failed
Open failed
Open failed
Open failed
Open failed
Open failed
Open failed
Open failed
Open failed
Open failed
Buffering track:2/2
Clearing tracks:2/2, 0
Starting buffer fill
runtimedb gathering not enabl
Clearing tracks:2/2, 1
Forcing rebuffer
bind: 0//.rockbox/.playlist_c
Check new track buffer
Request new track
Codec failure
Codec load error:-1
Codec load disk
Codec: Unsupported
Codec finished
New codec:0/3
Postbuffer:1/1
End-of-playlist
Open failed
Open failed
Open failed
Open failed
Open failed
Open failed
Open failed
Open failed
Open failed
Open failed
Buffering track:1/1
Clearing tracks:1/1, 0
Starting buffer fill
runtimedb gathering not enabl
Clearing tracks:1/1, 1
Forcing rebuffer
bind: 0//.rockbox/.playlist_c
DMA No Data:0x0001 <---------------- I think this is a clue
Check new track buffer
Request new track
[attachment deleted by admin, too old]