[CentOS] music stops..................

I have installed CentOS 5 with mplayer -1.0-0.34. from de dag's
repos,everythings going well while I'm just listening music ando doing
any easy job, but when I run yum the mplayer stops for a while and start
again, the sames happens with xmms.
I have a celeron 2.9ghz and 256mb ram  
I want to know why is this happening ? 
-- 
"Nuestra recompensa se encuentra en el esfuerzo y no en el resultado.
Un esfuerzo total es una victoria completa".
                                        Mahatma Gandhi
              (@ @)
   |------o00o-(_)-o00o----------|
   |Manuel Enrique Chávez Manzano|
   |manuel864 at gmail.com          | 
   |manny at cmc.cfg.sld.cu         |
   |GNU/LINUX User               |
   |#424754                      |
   |Usando CentOS 5              |
   |-------ooo--ooo--------------|
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