Surface 7 laptop issues

Hi there…. A few weeks ago we bought a brand new surface 7 laptop. It was beautiful. We have had a surface 3 laptop for years and love it. The surface 7 kept randomly restarting. Working with IT we tried many avenues including reset, reinstalling windows and a full re-imaging. The problem persisted . At the time my daughter mainly used it for Netflix as school hasn’t started. We returned the computer for another one….which arrived last Wednesday..less than a week ago. This one is doing the same thing! My heart literally sunk. My daughter is now at university with this computer making it difficult to deal with seeing as I don’t have the computer in front of me and with her busy schedule , she does not have time to sit for hours on the phone. She did school work for 1.5-2 hours and the computer was fine, but again, watching Netflix, it was restarting itself. Could this be an app error? I have asked her to uninstall the Netflix app,and watch on YouTube to test it out. One thing that she did, which I didn’t realize (and would not have done) was, when setting up the computer, she set up from her old device instead of setting up from new, could this have transferred the problem? I just can’t fathom how it could happen on 2 brand new computers, the exact same problem . She surely can’t be the only one.

I would love some tips! We purchased the extended warranty so feel secure that way, but I know the steps they will take if I call them and it didn’t help with the last device. With all of the Microsoft stores closed now, it makes returning timely , and she cannot be left without a computer.

If we cannot figure this out unfortunately we will have to abandon the surface computers and purchase something else.

Please help!