Random colour shapes occur when scrolling/navigating

Has anyone experienced random colour shapes occurring when scrolling/navigating around a doc page? I've been experiencing this anomaly for a while now. Usually it takes the form of a solid colour from the basic palette in use.

Sometimes the colours are solid, sometimes the involve a blend. Occasionally just thin grey lines (not guides or rules).

I also experience an issue with Acrobat flickering when reviewing comment notes on PDFs. Again a random thing.

I suspect both issues are more likely related to the graphics card (an AMD Radeon Pro 5500 XT 8 GB), but checking here to see if anyone else may have experienced similar, or has any useful advice to corroborate/resolve. I've enclosed screen shot/recording examples to assist.

Any assistance would be much appreciated.

Thanks and best, Ant Hannant