Bump. I am experiencing an identical issue to FixItMicrosoft in their June 12, 2020 post:
After updating to Windows 10 v.1909 on June 14, 2020, my Surface Book 2 (15" i7, 16GB) was suddenly running much hotter and a LOT louder than ever before - so loud it's distracting and so hot I'm literally worried it's headed for a meltdown. I looked for
help online, tinkered with the power settings, found and ran the Surface Diagnostic Toolkit, and no errors were found (tweaking reduced some of the noise at idle, but not under load).
I scheduled a call from Microsoft tech support. The earliest I could get was about 40 hours later, and I received the call right on schedule and spoke with a Tech who gathered my info and then put me on hold for 10 minutes. When he came back, he informed
me it was a hardware issue and said "we will replace the device." I asked how it could be a hardware issue when it coincided exactly with the update, and right then the call dropped. I waited five minutes and no call back. So I called MS at the number they'd
used to call me, (425)635-2970, and eventually got through to another Tech who had no record of the prior call (which confounds me: if there was an incident log that MS used to call
me, how can there be no record of it?). Anyway, she and I ran through diagnostics and remote access for an hour, but with no results. She noted that the v.2004 update should be available soon, but couldn't tell me how to get it. She was very polite
and helpful, but her focus seemed to be on turning off background programs to reduce CPU usage: not a bad idea, but if those apps weren't causing overheating
before, why would they now? In any case, after disabling startup programs and background apps, we still didn't see any improvement. She again suggested that it was a hardware issue - that only makes sense to me insofar as the
software is clearly making the hardware act up.
Since my MS manufacturer warranty expired about 8 months ago she told me that I would be eligible for a discounted replacement:
not an upgrade, but a discount on the same ~$2800 computer that I purchased 20 months ago. I told her I would wait to see what happens with the next update, and whether MS can fix this issue.
I continued digging after the call and learned that if I became a "Windows Insider" I would be eligible for the v.2004 update, so I did that today (6/19) and installed v.2004 hoping it would address my problems. It did not.
Microsoft, we are eagerly awaiting a fix for this, and it seems to be a not uncommon problem:
https://answers.microsoft.com/en-us/surface/forum/all/surface-book-2-overheating-issues/cef6939e-1687-46d7-a25a-c7457394d08e
https://answers.microsoft.com/en-us/surface/forum/all/surface-laptop-2-overheating/f30520fb-d31d-4923-bc7e-13fa343f4b89