It's worth pointing out, i don't think we have the exact same model. As mentioned in my signature, I Have a 1TB Samsung NVMe PCIe SSD installed with Sintech NGFF M.2 nVME SSD adapter. Do you have these too?I have the same model as you and have been using Monterey daily since almost 3 months ago without any problems at all...
You must be doing something wrong....