Why is my Galaxy S9 acting like it has a virus?

My Galaxy S9 turned on 12 days ago with random ads popping up everywhere, text tool bars disappearing, everything freezing every 5 seconds for a second (that's when the text disappears). I'm at my wits end! Its affecting everything I do on my phone. I've tried 3 different anti virus programs and none can detect a virus. Help me!

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