SpeedCubePro

So i recently got a the Samsung Galaxy A20 as my second phone ever, and I'm running into problems i don't know how to fix and i need help. So my phone, when I'm at work, would be in my pocket, and somehow, would turn on, unlock the phone all on its own, and out of nowhere and start typing in random stuff into the phone dial pad or open up random apps. I don't know how to stop this from happening and i need help... PLEASE.