Which are you using? (e.g., TIA Portal V17/V18, WinCC V7.5, or V8) Are you connecting via WebNavigator or Sm@rtServer ?
Keep a USB drive with the correct WinCC Viewer RT installer and license. When network downloads fail, a manual offline update often succeeds in minutes. wincc viewer rt download fix
The client randomly logs out of the SCADA system even though "Auto-Logout" is set to 0 minutes in the settings. Which are you using
If files are corrupted, insert your WinCC Installation Media. Which are you using? (e.g.