Hi AuAlbert!
It looks like the SQL BackEnd is not updating correctly the status for the
Rtcdyn Database which stores dynamic Lync/Skype user data such as presence information.
You can test this after apply the following commands from Lync/Skype for Business PowerShell:
If you have Standard Front End Pool:
Install-CsDatabase -Update -LocalDatabases
If you have Enterprise Front End Pool:
Install-CsDatabase -Update -ConfiguredDatabases -SqlServerFqdn <EnterpriseEdition BackEnd FQDN> -UseDefaultSqlPaths
Finally, execute the step 2 from Deployment Wizard in each Front End Server.
After complete these steps, logout from Lync/Skype and login back. Please let us know the results.
Hope it helps.
Regards.