Node Status, last Contact "17704127h 18m ago" since Update

  1. Stop the storagenode
  2. Check your disk for errors, fix if found
  3. Start the storagenode

The database is locked is happening with nodes with a slow disk or when the database is fragmented too much.
Usually it resolves itself after a while, but the restart is helping too. Also, you can try to vacuum your database:

By the way what the filesystem on that drive?