Red Series Dimmer Unresponsive after Red-Green-Blue LED cycle

Hi, I have a Red Series dimmer that worked for about 2 years and then stopped. The switch is now completely unresponsive but the LED cycles through red-blue-green when I perform certain troubleshooting steps. Here’s what I have tried so far:

1 Tried pressing config 8x: LED cycles red-blue-green but the switch remains unresponsive
2 Tried long-pressing config for 20s: after about 3 seconds, the LED cycles red-blue-green but the LED never turns the usual colors when you long-press on a working switch. The device remains unresponsive
3 Tried swapping with another known-good Red Series dimmer: works with the known-good dimmer in this location
4 Tried installing the unresponsive switch in another location: unresponsive and same behavior as steps 1-2 above.

Based on the above it appears that this is an issue with the switch. Any thoughts or ideas?