It might be stress on the bowden tube. I would try printing at half speed to reduce the force needed by the extruder in that area. You might want to get a new bowden tube as they can get ground up a bit and exhibit higher friction.
Have you used any "filled" filaments like CF, brassfill, glowfill, etc?
Try rotating the glass 180 and see if the problem moves with the rotation (just print a small cube or something in that area so you don't have to wait so long). If the problem moves, try flipping the glass over and see if that helps.
Also check that the heads of the screws on the build plate are properly countersunk and not sticking up.
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