hi there...my itunes player keeps freezing on my mac pro

hi there...my itunes player keeps freezing...it freezes about every 45 minutes...and does so in a very particular way...it will freeze for about 10 seconds play for a couple of seconds freeze again for about 8 seconds play again for a few seconds then freeze for about 5 seconds.....it then plays fine for about 45 minutes then repeats the 3 freeze process all over again...ive kinda got used to it...but now am wondering if i can fix it....any help will be much appreciated