It does not neccessarily need to be something with the main hardware. After around 6 months, my initial X1C had rubbed a hole large but hard-to-spot through the AMS-Buffer PTFE. I literally only found it when the filament poked me in the eye 
Did you replace the PTFE-tubes yet, making sure all ends are nicely straight and flush and fully pushed into the connectors?
It could also be that the connectors have been worn out.
I assume that problems are not related to any given AMS slot? Then the problem could also come from a worn filament switch.
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