porn-update

Hello to all,
May 17, my server service has warned me that in some of my sites pages there were malicious pop-up (Facebook Scam Malware). The pop-up coming from clickadu, popads, popcasch, etc. I advised the advertising companies and it was resolved by itself.

But that shit google from 17 took me about 30% of visits among all my sites and have not yet returned.

From 15 days check my sites, in every detail, I find nothing abnormal that would cause the continued lack of visits.

Can you help me figure out what could have happened (in addition to the pop-up) and how to resume visits?

something happened, around 17 of which are unaware?
is a normal behavior? The views will be back at some point? How long does it usually?
it happened to someone else? Maybe around 17?

P.S. I upgraded the server by about half of my sites about a month ago (from simple hosting to shared server), this could be part of the problem?

Thank you all for the replies