Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.
This means that the database server times out on these requests.
Make sure your hardware can follow or lower the amount of simultaneous scans.
Also: Why does the new version create a profile for the account used by the Lansweeper Service on every PC?
The previous version used the remote registry service to access the registry, version 3.5 also uses wmi for this.
The advantage is that you don't need the service dependency anymore, the disadvantage is that it creates a profile the first time it's scanned.