What is your memcache set to?
Make a backup of your nc_file_locks.
turn on maintenance mode
delete all in nc_file_locks
occ files:scan -all
sudo -u www php -f cron.php
taken from this Unlock files
What is your memcache set to?
Make a backup of your nc_file_locks.
turn on maintenance mode
delete all in nc_file_locks
occ files:scan -all
sudo -u www php -f cron.php
taken from this Unlock files