I am having problems when I go to www.youtube.com can you help me?

Whenever I try and watch a video on youtube, I can only play in increments of 2 seconds before it just freezes…and I’m not getting any sound? I can visit other websites and get video feed and sound….what is going on? I’ve tried refreshing the site repeatedly and the same thing just keeps happening. The entire video loads through, but I can’t watch it!!