Mysterious LDAP Failure

I am running a FreedomBox Pioneer with Debian GNU/Linux 11 (bullseye) and FreedomBox version 22.7.

This morning about 6AM local, My DAVX5 client received http error code 500. I attempted to connect to the Radicale server to diagnose the problem with my FreedomBox web interface and was unable to connect due to bad user name or password. I could not log into Cockpit with my admin username and was told that I had used the “Wrong user name or password”. I attempted to SSH onto the box, and received similar errors. In the web interface in the System tab, going to the “User & Groups” control showed the message “User & Groups not running”. Running diagnostics from here indicated that scapd, TCP and UDP port 389, and LDAP failed. I restarted the FreedomBox and obtained the ldapscript log below.

I shutdown the FreedomBox, disconnected the battery, made an image of the sd card on my laptop, reinserted the sd card, reconnected the battery and restarted the FreedomBox. So far it seems to be running fine.

What went wrong, and what must be done to prevent this in the future?

SASL/EXTERNAL authentication started
SASL username: gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth
SASL SSF: 0
Mar 26 07:19:33 XXXX ldapscripts: ldapid(root): /usr/sbin/ldapid adminuser
ldap_sasl_interactive_bind_s: Can't contact LDAP server (-1)
  -> User adminuser not found in LDAP
Mar 26 08:44:44 XXXX ldapscripts: ldapid(root): /usr/sbin/ldapid adminuser
Mar 26 08:44:44 XXXX ldapscripts: ldapid(root): /usr/sbin/ldapid adminuser
Mar 26 08:44:44 XXXX ldapscripts: ldapid(root): /usr/sbin/ldapid adminuser
ldap_sasl_interactive_bind_s: Can't contact LDAP server (-1)
ldap_sasl_interactive_bind_s: Can't contact LDAP server (-1)
  -> User adminuser not found in LDAP
  -> User adminuser not found in LDAP
ldap_sasl_interactive_bind_s: Can't contact LDAP server (-1)
  -> User adminuser not found in LDAP
Mar 26 08:47:12 XXXX ldapscripts: ldapid(root): /usr/sbin/ldapid adminuser
ldap_sasl_interactive_bind_s: Can't contact LDAP server (-1)
  -> User adminuser not found in LDAP
Mar 26 08:49:39 XXXX ldapscripts: ldapgid(root): /usr/sbin/ldapgid -P admin
ldap_sasl_interactive_bind_s: Can't contact LDAP server (-1)
  -> Group admin not found in LDAP
Mar 26 08:53:10 xxxx ldapscripts: ldapgid(root): /usr/sbin/ldapgid -P admin
ldap_sasl_interactive_bind_s: Can't contact LDAP server (-1)
  -> Group admin not found in LDAP

After further investigation, there was an automatic upgrading occuring, but no indication that it was going on, even 3 hours after it had begun. Any further advice? Should LDAP and slapd have been down that long? How do I know when an update is taking several hours to complete? How long should I wait before I restart or pull the power plug?