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I have also had this happening in the pop-up literally comes up every 20 seconds. It doesn't matter if I choose agree or disagree I have tried the message app settings there's nothing in there to remove it and the Gmail settings also nothing to remove it that works please help
@Laura G: From what I understand this is a Gmail feature, therefore if you're unable to disable the option in the app itself then head to Settings > Apps > Gmail > Notifications and explore your options here. I'd recommend running through the various subcategories and disabling 'Show As Pop-up', or just toggling off notifications completely if you don't use the app.