Recurring Exhaust Leaks After Bolt-Ons

Los Donuts

Hi everyone, so I wanted to see if anyone has been having similar problems with this issue and if there's any solution that helped them. I added a full bolt-on setup to my Z this past December (Stillen Gen 3, ARK Grip full catback, Motordyne ART Pipes). In the same month, I had an exhaust leak coming from the downpipes so I went in and got it fixed. Now, not even 2 months later, I once again have a leak. I am assuming that it is coming from the same place. The parts are all new for the most part with no scratches or dents or anything, and the gaskets are all brand new, so I don't know why I keep getting this issue. Could it be from the bad road conditions or cold weather? Would love to hear some advice because I want to get to the bottom of this once and for all. Hate having that CEL staring into my soul.

__________________
2016 Black Cherry Nissan 370z Touring 7AT
Stillen G3 CAI | Armytrix Valvetronic Exhaust | Motordyne ART Pipes | GReddy KW Performance Coilovers | UpRev Tuned