Thank you for the details of the issue you are experiencing on your MacBook Pro. It looks like you are occasionally getting some image distortion.
I found an article with steps to troubleshoot issues with displays. This article is for internal and external displays, so you can skip any steps referring to an external display. I recommend reviewing the section titled "No video or no signal, image distortion, 'snow,' or flickering", but this step specifically stands out to me for the issue you described:
Reset the system
You can find the full article here:
Thank you for posting in the Apple Support Communities.