If I clear the entire cache on my ellipsis 10, will I lose all my stored data?

I'm trying to figure out two things  regarding my ellipsis 10. If I ckearmy cache completely, will I lose all of my saved data?, and has anyone had issues with their ellipsis 10 where any time you try to read any a rticles or stories or play  quiz games, flashng black lines and bars block the text yourey trying to read?

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