Pop up when I launch an app on my Note4?

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AC Question

Pop up when I launch an app on my Note4

When I click on an app, example Facebook Messenger or Email app, a Chrome browser page appears like a pop up and shows me ads about Virus (''your phone is infected, bla bla bla'') or brings me to Google playstore.

It happens often when I didn't use my phone for a while, unlock my phone and click on an app.

How to solve this issue?
Thanks