It seems to be one of those cell phone things that's a real pain in the ass to deal with. The only thing I can do at this point is block the url directly. If it happens, please see where the link is so I can manually do it for each.
Its back. Are you using an ad server other than google?
BTW, I am posting this from a desktop PC because I cannot access the site on mobile.
I'll continue to investigate. I've changed nothing with any settings since you guys first reported it last year. Something had to have changed within AdSense that now allows this crap to come back. In the mean time, I blocked that URL too.
This is a known issue. Apparently when an ad is supposed to pop up, there's a url imbedded in that it waits 7 seconds and activates. Its been around a while and no one has yet figured out a workaround.