Hi Let first restart the device and check if it resolve the issue. If the issue still persist you may clear the App Data Cache for the Office apps and check if it helps. You may refer to this PowerPoint files recovery s solution or below steps to clear the App Data Cache. 1. Go to Settings select on App. 2. Go to the particular Office application right click on it a select Clear Cache. 3. Repeat the same with the Other Office applications such as Excel PowerPoint. 4. Re launch the app and check if the issue persist. Hope it helps.