I own a macbook pro and i have had it for about a year. I has worked very nicely until now. When i watch a video on the internet (on websites like youtube.com) the video regularly stops for a fraction of a second. This is very annoying and i have a feeling it is getting worse.
It also happens when i'm watching a dvd, but less often.

Is this a problem with the graphics card?

my specs:
GeForce 8600M GT
Model Name: MacBook Pro
Model Identifier: MacBookPro4,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 3 MB
Memory: 2 GB