Update.
I have primarily used my SP4 via monitor since end of Aug and not experienced any flickering when using in tablet mode, even over longer time.
So I was again a happy owner in regards of the SP4 and started to check up the new surface book last week and actually thinking about getting one next week.
BUT today, my screen has started to swell. From left lower corner and app. 8 cm up the screen has released itself from the tablet.
It has never been dropped or seen water and I need to check purchase date, but app 2 years old. And I think I can throw it in the bin since I bought it in Thailand.
So happy with the product initially, but also so disapointed with the reliability now. Back to Samsung or give Mac a try?
I dont need anything this small if the reliability is as bad as this thread shows.

Warmest part on my SP4 during heavy flickering and just before completely crashing is right above the F7 key.
Temp was 45.8 degrees celcius on the screen just before the laptop crashed and restarted.
At the backside, in the mid of the top half - app 43-44 degrees C
After cooling off 30 mins I detached the SP keyboard and connected a wireless keyboard. But still same problems.
I monitored the temp at the spot above the F7 and it rose from 25 to 40 degrees within 10 mins and now staying around the 40 degrees
I was hoping the external keyboard would help, but it didn't.
Anybody know if the cooling channels on these laptops are so narrow that they need a proper cleaning every year?
Front
https://i.imgur.com/vTBWGyR.jpg
Back
https://i.imgur.com/sw5YUGG.jpg
Zoom
https://i.imgur.com/yoNnJbQ.jpg