When a device (dimmer, WPM, Grafik Eye QS, keypad, etc.) is having communication issues, a good troubleshooting step would be to out-of-box it and re-add it to the system. When it comes to the Main Repeater communicaiton, we would recommend caution when thinking about out-of-boxing it and having this step as a last resort. If you out-of-box a Main Repeater, it will dissasociate all of the system components and they would all need to be out-of-boxed and re-added to the system to regain communication. If this is a new install, it may not be an issue. But for an existing system, it would be a good idea to exhaust all troubleshooting options before out-of-boxing the main repeater.