I never reported back here, but I was able to return in January (extended holiday return period) of this year for similar problems. The unit kept reporting hard disk issues that diagnostics never validated. Lenovo wouldn’t replace it, so I returned it.
I really loved the form factor and size (especially with Win11), but the system was too unreliable for me even after spending weeks doing updates and reboots of all types–I also needed to connect a USB keyboard during the reboot process MANY times. I suspect that there was some kind of a driver problem with WIn 11 that Lenovo never got around to fixing.
I hope that you have better luck!