Verify that the Amazon WorkSpaces client application icon appears on the desktop. If you’re having trouble updating your WorkSpaces macOS client application to a newer version, use the following procedure to update your client application. … This can be caused by events such as closing the laptop lid, or the loss of your wireless network …
https://docs.aws.amazon.com/workspaces/latest/userguide/amazon-workspaces-osx-client.html