I am experiencing similar issues with my SP7.
I always leave my surface pro 7 plugged in and on. I have a screensaver that turns on after 30 minutes and the battery settings are set to "Best Battery Life". Some nights I would leave it on overnight and find it still working with the screensaver showing
and some nights I would wake up to find it dead, still plugged in but the white light on the charger is off. On very few occasions the surface stopped charging while I was using it and I only caught it before it died because I would receive a low battery notification
on my screen.
I'm aware other users experienced this issue but I have found no solution online that resolves the issue. I have updated battery driver, I have disabled hibernation and sleep settings, and the only way to charge the surface again is to disconnect the battery
adapter brick from the cable connected to the wall and reconnect it - only then will the surface charge again. I don't feel this is a hardware issue as this problem has been occuring since I purchased it last year and I'm not sure how this would be a software
issue because everything is up to date.
To answer any follow-up questions: I have not tried another charger, I have not tried the charger on a different surface pro.
Thanks for any help.