I have five Caseta switches around the house. One keeps going haywire and the fixture will not turn off. The system has been active for 5-6 years and the others have no issues even the ones that have the same fixture type downstream. I am assuming I need to install the load capacitor for this one fixture. In the past, resetting the switch to factory default and re-adding the device usually fixed the problem for a couple of months. Now, that does not work and the fixture stays on all the time even though the app says its off. When I hold down the off button, the LED on the switch flashes a single time in red then goes back to green. Am I on the right track to add the capacitor? Or has the switch been damaged by a power spike?