we were having the same problem the last few months, abusive experience status was going back and forth between passing and failing, sometimes without us making any changes
we've been passing for at least a month now, the only changes we made were removing externally-linked nav tabs, and we switched to a different ad network for popunders
Its possible that your pop code looks more suspicious to google than other ad networks. specifically: you said you set the pop to be google compliant, but 1) there might be malicious landers coming from other publishers with that ad network -- so google might see that whole adnetwork as being more suspicious (even though you set your pop code to google compliant landers) and 2) every ad network offering self-serve ads suffers from malicious advertisers, who make new accounts and cloak their landers to get around the ad networks guidelines. So if you're with a self-serve platform, your site *will* be showing malicious landers sometimes, even if you strictly forbid it.
So, definitely take a look into other possible popup networks. There *are* some that will never show a malicious lander -- specifically, ones that don't offer self-serve campaigns.
Its also possible someone is reporting you (and us), trying to hurt your business. not much you can do about that other than disable pops for a few weeks, get passing status, and then put the popunder back up. if its someone with malicious intent reporting you, they will get bored eventually, same as anyone DDoS-ing your site.
if any of your nav tabs leads to an external site, definitely remove those links.
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