kernel: Limiting closed port RST response

Hi, I began to face the following problem: when I try to play a video in iTunes (1080p) it freezes and Console displays this type of message:

kernel: Limiting closed port RST response from 281 to 250 packets per second. It started when I was using Wi-Fi, but to test whether it happens with wired connection I today plugged the cable into Ethernet port of my Mac and the story repeats with iTunes video freezing over and over again. Is it Apple's bug or could I fix it on my own? If I could then how? I noticed, though, that if I play a video in 720p I have no problems. All is beginning to screw up once I play Full HD. Does it mean I never won't be able to watch full HD content via iTunes?

iTunes 10.6.3

Appreciate any help,

I.S.