Thank you for your post.
I believe this might have something to do with the graphics card on your laptop struggling with the second screen.
To check what graphics card you have, please follow the steps below:
1. Go to the 'Control Panel'.
2. Select 'Device Manager'.
3. Select the arrow for 'Display adapters' to expand it and it will show you what your graphics card is.
Would you be able to please let me know what graphics card is installed in your computer?