Hmm, I'm doing a bit of research on the problem and it seems kinda common, though it usually occurs randomly on many different websites. If you use mainly VGCollect though, this could explain the fact that it's mostly here.
Other than that, people are blaming a few applications for intrusive ad-pushing, including AdMob, AdBlock and Music Paradise. It seems like an old issue that has went and come back a few times, so it's likely that people could have started doing it again. Nobody seems to know what to do though
I'l keep you updated if I find anything of use to fix the issue.
YouAppi seems like they're a company that people pay to have them redirect ads to their app.
