Hello GeoffreyMArnold ,
Thank you for reaching out Microsoft Community. Thank you for your reply, right now we need to try performing a fresh start in your Surface for us to isolate if this is just a software or hardware issue.
If this answer your question, we highly encourage you to inform our Community by clicking on Yes or marking my post as an answer. This will help other members who may have the same issue as you. Otherwise, don't hesitate to update us so we can further assist you.
Regards,
Jonas_T