Hello Michelle,
Thank you for posting in Microsoft Community
I understand that you are having issues with your Surface that disconnects from the wireless projector after 10 seconds. You got me here and we'll definitely isolate this issue together. Before anything else, allow me to ask few questions:
- What cables did you used in connecting your Surface Pro 7+ to the Wireless projector?
- Have you tried using other cables in connecting the two?
- also, please confirm if you're using a Surface Dock when connecting your Surface Pro 4 to the projector/external display?
For now, to solve the issue, let's exhaust all these steps:
- Run SDT by clicking this link: Surface Diagnostic Toolkit - Microsoft Apps. The said toolkit will check then report other errors then fix it and may update your device as well. Once you ran the toolkit, please follow the on-screen instructions.
- Download a drivers and firmware to your Surface Pro 7+ by clicking this link: Download Surface Pro 7+ Drivers and Firmware. from Official Microsoft Download Center
- If any case you are using a Surface Dock, I would suggest downloading a drivers and firmware to it as well. Visit this link: Download Surface Tools for IT. from Official Microsoft Download Center
You may also check this link: Connect Surface to a TV, monitor, or projector - Microsoft Support
Please let me know if this works. Hope this helps!
Kind regards,
Rolando S.