We have locked down the network ads to sources we trust. That’s no guarantee of course as even Google’s Adsense network have been hacked by rogue ads in the past, but right now I can’t replicate any issues at all.
Which makes me suspicious about the possibility it could be malware.. in particular the Hummer malware that is currently infecting millions of handsets around the world. One symptom is pop up ads. The other is background installation of apps. Could be worth checking that there’s no apps on your phone you don’t remember installing.
As ever, screenshots to ads@singletrackworld.com and we’ll try and track things down at our end.