Guys I think I noticed something weird.
I have my sysnand and emunands unlinked. I have fake connections on sysnand wifi.
I used the CN exploit yesterday with 100% success on launching... And I used it over 30times only yesterday with no fail on launching at all. Notice that I had the wifi enabled all day yesterday. Today I turned off wifi and I tried to launch CN exploit. 3 Times it failed in row. I suspected that it could be because I turned off wifi. I turned wifi back on and the CN exploit launches again without any issue.
I have not found a correlation with wifi on any of my 3 consoles. But if it works for you great!