Okay wathcing video in youtube. If another one loads in steam, or another tab, or even on a website I'm viewing even if I don't click play the first video's volume lowers considerably. This is driving me up the wall as I constantly have to refresh to reset the sound, but opening new tabs will usually result in the video volume going low. It even happens when I open minecraft. This just started randomly happening to me today. Any ideas?

Edit
Also will happen if I listen to an internet radio channel. It's super annoying. Hrrrr! I suspect it is java or flash related or something.

maybe drivers have updated? ive been discovering that alot of the seemingly random changes on my computer, despite not installing any thing, seem to be attributed to drivers which have a tendency to update themselves.

also, who the hell knows what changes are being made when windows updates all the damn time :/

Hence my confusion, it just started randomly. Across two programs. Firefox with youtube/internet radio stations and minecraft.