I don't necessarily experience these things at the same time, for all I know, they could even be unrelated.
Things that I've tried so far:
-Updating my wireless adapter driver.
-Updating my bios (just to be sure)
-Turning off RSC
-Disabling power saving for my adapter
-Checking the wireless connection log. There were no errors recorded whatsoever.
I also tested it with another laptop that has an 8265 adapter, and I got similar results. Managed to reproduce 2/4 problems in a brief amount of time (the internet slowdown and pink patches on the screen).
I did contact them but they are yet to find out what's causing it. It goes without saying that an OS is necessary for using an adapter so I don't think it's a stretch to ask for help from the adapter's manufacturer regardless of what's causing it. It's also plenty possible that the problem's with the driver.
Thank you for posting on the Intel® communities.
I was checking this thread and I would like to mention that the information provided by Al.Hill is correct.
It is worth mentioning that Miracast* is no longer supported and support should be addressed to your Original Equipment Manufacturer (OEM, PC-laptop manufacturer) or Microsoft® support, and in the case that a driver issue would be found, the OEM/Microsoft will determine root cause and work internally with Intel.
For more information, please refer to Using Miracast* with Windows 8.1* and Windows® 10
We will proceed to close this inquiry.
Intel Customer Support Technician
A Contingent Worker at Intel