Hub Offline in app but everything still works

Same issue for 2 days. iOS app, V1 Hub, Echo devices. The following steps from Smartthings customer service helped me. Probably they have fixed the issue for some.

  1. Uninstall and reinstall the SmartThings app
  2. Disconnect the power and ethernet cables from the Hub
  3. Wait at least 30 seconds
  4. Reconnect the power and ethernet cables
  5. When the Hub is back online, its LED will turn solid green