Linux Mastering Development Ubuntu

Ubuntu 18.04 w Radeon HD 7570 Freezing Randomly

I just upgraded one of my machines from 16.04×64 (working fine before) to 18.04. Everything is working well except seemingly random freezing, which I assume is due to my video card based on similar symptoms on a different computer. When it freezes, I can switch to terminal using Ctrl+F3 combos and can see the screen but am unable to click or move anything.
lspci | grep VGA gives me

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Turks PRO [Radeon HD 7570]

How can I fix this issue? Loading Ubuntu’s ‘additional hardware’ screen shows no available drivers to choose from. Thank you for your help!

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