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To be fair, I fixed the shifters to the bars myself when I swapped for a longer integrated stem/bar. There's plenty of hose between the frame and where it'staped to the bars but obviously not quite enough between the taping and the shifter and this pulling on the hose is causing the block inside the shifter somehow.
Get in touch with Canyon.
I'll say that probably the position of the levers on the bars is applying pressure on the hose or the levers have been over tightened.