Reply to Quality of Kontrol Components

I'm posting this thread somewhat out of frustration but also curiosity.

I'm currently on my second Kontrol S2 (after failed FX button warranty replacement of the first) and need to send it in yet again for another repair (faulty encoders). I really am just curious if the components of these controllers are just not up to par for daily use or if I have just gotten unlucky. I am a fan of the Kontrol line (use an S2, F1 and X1) but really can not stand having faulty components.

Can these units be upgraded without major surgery? Or are some the other units (Vestax or Pioneer) have more reliable components? I've done a fair deal of searching but haven't found anything conclusive.

Thanks for the info.