it could have possibly happened before that, but to the best of my memory it was after the update. I noticed these changes, the sudden power off included, after the windows update 1909 a few months ago. The battery also looks like it drains a lot faster than it used to. I bought a brand new battery and when the laptop is unplugged from the mains and left to battery usage alone, it still turns off at 3 quarters full. All the posts i've read suggest faulty batteries, to which the OP's mostly reply that they've change the battery and still have the same problem, like myself. My Toshiba Portege R930 turns off suddenly when it's anywhere around 60-70% charged when operating on just the battery and the mains is disconnected.

We'll leave this link to the forum post so you can scan through it for answers while you wait for Microsoft to step up.So i've been searching article after article for an solution to this but still a no go. Microsoft hasn't provided a satisfactory resolution for these random shut down problems and other user-posted solutions are complicated and won't work for everyone. If that doesn't work, I'm afraid you might need to send your device in or get Microsoft's support team on the phone. Again, head over to the search bar and type 'Search for updates.' On the next page press the Check for updates box. You should also ensure you've downloaded the latest software update for your tablet. Type 'Sleep' in the search bar and select 'Power and sleep settings.' From here, change the sleep time from the default 5 minutes. If your Surface Pro 7 is randomly shutting down, try changing the default sleep time in your settings. There doesn't appear to be a one-size-fits-all fix but some folks have had luck by making certain changes. The problems appear to exist across all Surface Pro 7 model, no matter your configuration. The thread about random Surface Pro 7 shutdowns is now 28 pages long and growing with the newest posts added on April 15. However, several users say their tablet continues to shut down after completing the steps. When the post went up, a Microsoft agent quickly stepped in with instructions for a potential fix.

Surface pro 3 turns off when unplugged