How can one get rid of pop-up adds on Samsung tablet

Just when the tablet is idle, with or without any browser or app open, annoying adds randomly pop up and colonize the screen. For a few seconds you have to wait until a closing "X" tab appears. These adds are from "Vungle" and "HRS". I have checked and ensured that my web browsers (native plus chrome) do not allow pop-ups - so the issue is not pop ups from browsing.

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Did you happen to install ANY APPS?

When you download certain Android apps from the Google Play app store, they bundle in Vungle and others. Start over with a factory reset and add one at a time till you find the app with the adware.

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Thanks Proffitt

I will try factory restore - painful but I guess only solution in this kind of a problem

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