Each time new updates are downloaded to the NavStick/NavBox, all permits are being renewed for the active cells within your operation area. Permits for cells that have been terminated or are no longer inside your operation area will not be included in the permit file, and will eventually expire on the ECDIS. In order to solve this, we recommend removing all permits from the ECDIS and loading the latest PERMIT.TXT from NavStick/NavBox.