Active PHP modules reset due to unknown reason, find which and enable (again).

Many nextcloud errors due to php_posix en its subs not being eneabled on the server. I logged into the admin account of the server with cpanel. Navigated to php modules and enabled posix and the sub modules my log files mentioned. I repeated this several times to find all subs.
Remooved the maintenance mode flag in the config file.
Re-ran the Nextcloud updater and it worked (again).