Well, that's probably what did it then lol.
I've been thinking of going back to a custom loop. (Using H100 only right now) i had a custom loop on my previous build, and i miss the lower temps on my OC'd graphics cards. (I live in south US)
But that loop sprang a leak on me after about a year and killed my graphics card, so I've been hesitant.
I hope I will never have that happening to me. How much did you leak test your system? I've also gone over every nipple and tightened them.. Will do so again soon I think.