Hi, Nothing useful for you here, but I just wanted to let you know that I have the same occasional issue on my XPS 17 9700 (Sometimes when switching to another tab). I also have some light flickering when using Photoshop as well, that seem to be related with a dual graphics card situation. Got in touch with Dell customer's support but they couldn't do anything for me, and tried some things suggested by Nvidia support but nothing has worked yet (Related to my photoshop problem, though).
I think I may have resolved the issue. I got my XPS 17 9710 today and the screen was flickering, blurring, and shifting all over the place. I opened up the Device Manager in Windows, expanded Display Adapters, and saw 2. "Intel(R) UHD Graphics" and "NVIDIA GeForce...". I right-clicked the Intel one and selected "Disable Device". It hasn't flickered again in the last 10 minutes. I hope that was the fix.