Thanks to everyone who has participated in this investigation. I’ve alerted Microsoft to the problem. It definitely seems to be related to PowerPoint on certain hardware.
If you are affected and have direct Microsoft support, please contact them so additional cases can be added to their case logs. If you don’t have direct support, go to the PowerPoint Help menu and choose the send Feedback option to display the feedback form.
Explain the details of your hardware, os, powerpoint version and describe the problem. You might copy the URL of this thread and paste that in as a reference. Microsoft doesn’t generally reply to the feedback submissions, but if you include your contact information
in your feedback at least they could contact you if they wanted to.