Hi Howe,

One possible reason why screen flickers is incompatible app. We suggest that you follow the troubleshooting steps provided on this link. If the problem persists, you may check if you have Hyper-V installed and turn it off. Here's how:

Select the search box in the taskbar, enter programs and features, and select Programs and Features. Select Turn Windows features on or off. Remove the check from Hyper-V and tap OK. Restart the Surface device.

Let us know if you need further assistance.

Regards.