At firealarm.com, we’ve encountered similar issues with the Notifier FPTI-951-IV before. First, ensure that the power source is stable and the connections are secure. Check if there are any visible signs of damage or loose wires. Additionally, review the device’s manual for any error codes or troubleshooting steps specific to this model. If the problem persists, consider contacting Notifier’s technical support for further assistance or scheduling maintenance with a certified technician.