Play Store popping up after unlocking my phone

Within the past week, at least once a day, whenever I unlock my phone it opens to either the Play Store (if I'm connected to the internet), or to my browser with an ad- that I'm assuming would lead to the play store, for random apps. It wouldn't be that big a deal but today I left my data on while I wasn't using my phone and it used up a majority of my limited data. I would appreciate help in solving this predicament.

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