Thanks again everyone, I'm sure you are all dying to know what happened.
The sound card was just dying, it's now constantly choppy and everything sounds like it's un-un-un-derwater, same at any volume, on any speakers, think it's a cheap DAC chip problem or something, just worn out - buy premium, people!
One thing I did notice, Flash is terrible in terms of CPU usage efficiency, VLC can play blu ray resolution, Flash over-burdens the CPU with 480p (even after it has fully buffered). So I'm wondering how much iPhone/Android battery life is wasted on inefficient web video playback.
Maybe EU regulations are required to force Flash to be more efficient (like Washing Machines are etc) I'm serious!
