Outdoor Lighting not connecting or flashing

Hi all, I have multiple runs of 5 lights so capacity is not an issue. They have been installed for 4 years. Recently some of the lights flash constantly while on. Any suggestions on how to trouble shoot.

I’ve just started searching all around on this topic because I’m in the same boat. 4 years, multiple lines of outdoor Hue lights ran, all not overloaded according to Hue requirements. Just recently started flashing. Usually after a while of flashing they then stop working altogether. One by one it seemed. I’m dwindling down fast it seems in the front of my house. 7 out of 15 in the front of my house are doing this.

I’ve stopped using themes an select certain solid colors and the flashing stops for a while