Hi pots123,
Thank you for reaching Microsoft Community. We appreciate for sharing your concern to us. Let me ask few questions to know more the details of the issue.
May we know what build version of Windows are you on?
When did you started to notice the issue?
Any changes made in the system settings prior to this issue to occur?
Does this occur whether the laptop is running on batteries or a power source?
You may try the following troubleshooting steps and see if issue persist.
Force the device to shut down and restart to clear hardware cache.
Press and hold down the power button until your Surface shuts down and restarts and you see the Windows logo screen (about 20 seconds), then release the power button.
Run Surface Diagnostic Toolkit and check Windows updates including optional updates if available.
See: Fix common Surface problems using the Surface Diagnostic Toolkit (microsoft.com)
To manually check for updates: Go to Settings >> Update and Security >> Windows updates >> Check for updates.
Update your Display driver.
Open device manager >> expand display adapters >> right click on the display driver and select update >> search automatically for drivers and follow the on-screen instructions.
If that didn't change anything, then uninstall and re-install the display driver.
Open device manager >> expand display adapters >> right click on the display driver and select uninstall >> if prompt to permanently delete the driver leave the box uncheck and select uninstall >> then restart your Surface.
Update drivers and firmware
Check what is the current OS Build of your Windows version. On the search box type Winver and hit the enter key.
Go to Download driver and firmware for Surface, choose Surface Laptop. Then click the link next to Surface Laptop 3 then click Download on the next page. Choose the .msi file that matches your current OS Build and click Next. After downloading, run and install the .msi then Restart.
Clear cache on both Microsoft Edge and Google chrome browser. And check if that makes any changes.
Let us know if issue persist so we can provide further troubleshooting steps.
Kind regards,
Lavenia