@Nodiaque 

The lights are exceeding the maximum load? I've done this before and finally realized it after ruining 3 switches.

  @TTTusp I doubt 4 led light is exceeding the maximum light, they are 9w each.

I found out the problem (well I'm pretty sure it's that since it hasn't happen again).

I had a wifi problem where some device would randomly stop working. I woke up last week with all my device offline connected to a specific router (which was the iot router). Since I switched all device to my unifi ap, I haven't got this problem again.

So in my understanding, there's something in the coding that if wifi is bugged for an unknown reason, the switch doesn't work. It's like if it's waiting to published it's state or something.

I'm still not 100% sure it's the problem, but I haven't seen the problem back yet since I did that change.