Most of my house came with Caseta switches and NDR Razor recessed lights. The house is about 4 years old. Everything works perfectly, except for one room. In that room, first 3 of the four recessed lights stopped working consistently, and a few months later now the fourth one basically stopped working and is just flashing. I swapped a light previously with a spare to no effect so I'm inclined to think either the switch is failing or there's something else like a wiring issue, but I have no experience with these type of systems so I'm not sure what I should be thinking. Is there any likely cause other than the switch itself having failed? Thanks!

e - the switch in question is a PD-6WCL, and changing the high and low trim seems to do nothing.