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Problem with laptop after adding a new battery and RAM

I have a 15 inch HP laptop.
It's about 2.5 years old and the battery began to die on me.
So, I bought a new one from amazon and added 8GB of RAM while it was open.

The battery lasts several hours when it is unplugged, and it processes much faster. Great!

But, sometimes the screen locks up. I can't move the cursor.
I have tried hitting function/insert and that works, but then a blue highlight expands over the page. If I move the page up and down it highlights the entire page.

If I try using control / alt /delete, it returns to normal after I x out of it.

But then the problem randomly returns later.

It has to be something simple I am overlooking.

Any suggestions?
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Those kinds of intermittent glitches make me suspect RAM compatibility is the issue. If the the two RAM sticks have different timings, it will revert to the worst values, but even then difficulties can arise. Board manufacturers don't usually test mixed brands of RAM together; all testing and verification is done with matched pairs. That's why most RAM is sold in pairs or quads from the same manufacturing run.

See https://techfident.co.uk/can-you-mix-ram-brands/