oes2018Sp1: after latest updates I lose nss functionality

We are running 2 servers with Oes2018 version 2018.1 Sp1, and after the latest online updates, I lose the nss volumes together with nssmu failing to work. The nss partitions are still there, but something is broken. I probably have missed something in the documentation regarding this issue, but would be grateful of any pointers to resolve this problem.