Screen freeze and other issues with HP envy (Ryzen 5 2500U, AMD Vega 8 mobile graphics)

I installed Ubuntu 20.04.2 on my Laptop with Ryzen 5 2500U processor.

1. I am facing frequent screen freeze issue and I have to restart the laptop everytime it happens.
2. Also, touchpad sometimes doesn't work and I have to restart the laptop for the same.

Can anyone please help me to point out what might be the root cause? I just expect my laptop to work without having any freeze issue and remain stable for days without having to restart. Any help is really appreciated!

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