Since than one mounth i've always "authentification refused" every time i leave my desk and i tried to connect to my computer.
When i come to the computer the icon teamvewer is orange in the task bar if i click on the teamviewer icon and i retry to connect all is ok
Is your computer configured to confirm incoming connections?
Check Options > Advanced > Advanced settings for connection to this computer > Access Control
Setting may be at Confirm all or Custom. Try changing to Full access.