Same issue with the Wii U browser, but if you set it to Chrome, it works okay.
Shtinky's forum posts
@shtinky: Technically, the Bombcast is the flagship of Giant Bomb. I get your frustration, but even though I couldn't watch it this weekend after I missed my chance to just download it, I knew that there'd be a good reason and it sounds like there totally was. Stuff happens. They're a small staff. Give them a break.
In Giant Bomb we trust.
What was the reason? Because according to wemiblelec90, the issue was resolved by merely shifting the audio (after a certain point, according to fodigga).