One string of lights out of box would not turn on. I purchased 100ft of thé AI LED permanent outdoor lights (E1-60-US). I tested them in the house before installing and they all appeared to work. Once I went to install on the exterior of my house, the fourth string of lights will not respond or turn on. It flashed for a few seconds on a random light sequence, and then would not turn back on and remain turned off since. I noticed this as I was about to mount them so I stopped the process. The remaining three strings are working perfectly and responding as expected with the Lepro APP.