mplayer hangs after a few movies

hi

i want to play mpeg2-files with my DVB-S technotrend card. the playback
works like it should, but after a few files (sometimes after the second movie,
sometimes it needs hours) mplayer hangs, the picture is black and the process
is shown as "sleeping" in the process-list. mplayer doesn't print out any
error-message, also not in verbose-mode. once again - i can play one file
without any problems, but if there are more files in the playlist the problem
occurs.

start-command: mplayer -vo mpegpes -ao oss -afm libmad file1.mpg file2.mpg ...
the other options have the default-values. (i use oss and libmad to get a 
clear sound)
mplayer is compiled most like VDR:
configure --prefix=/usr --disable-x11 --disable-xinerama --disable-fbdev 
--disable-vesa --disable-tga --disable-jpeg --enable-mad --disab
le-ftp --disable-network --disable-edl --disable-tv --disable-mpdvdkit 
--enable-runtime-cpudetection --disable-mencoder --enable-largefiles
 --disable-png --disable-vidix --disable-smb --disable-gif

suse 9.1 / kernel 2.6.4-52
P4-2.4GH, 512Ram, DVB-S (FF) technotrend card

someone has an idea?

thanks
lukas