As mentioned earlier in this thread this exact problem also occurs on the new Surface Laptop 3. It only seems to occur when running on battery.
When i received my first SL3 around Christmas i had the exact same issues. After allot of fresh installs and suggested fixes the problem still occurred. Therefore i contacted my supplier which registered it as DOA and send me a new one.
This new SL3 didn't had the issue so i was very happy! Only not for long because after just a few weeks of usage i found a crack in my screen. Knowing i handle my laptop with care this couldn't happend due wrong usage. Therefore i searched the internet and
found out allot of SL3 users are reporting the same cracks appearing on there laptop. With this information i contacted MS (because this wasn't a DOA my supplier couldn't help me) and they agreed to exchange the laptop for a new one.
Within just a few days i received a new SL3 and again i was very happy! Only this time for even a shorter period because after just 30mins my laptop crashed again.... So again i contacted MS to report this issue. When i gave the support my SN i recognized
the last 4 digits.... So i looked up my first email conversation with my supplier and believe it or not i got my first SL3 back!!! (what are the ods?? From MS to supplier to me to supplier to MS back to me...)
Luckily my MS support contact helped me out great (Thanks John!!) and send me a new one. Only due Covid19 they were out of stock. Therefore i've waited 5 weeks to receive a new one which i received yesterday :D
And guess what; It has the Fu..ing same randomly shutdowns!!! :'( So again i'm waiting for a new replacement...
i'l keep you posted :D