X1C Vertical artifact help - support is unresponsive.

Hey all. I upgraded to an X1C after years of tinkering on ender style machines and I'm blown away at how easy and great this instrument is.

Unfortunately I'm having some issues with vertical artifacts. I'm not sure if it's ringing or something else, but it almost seems like the indents are in line with the teeth on the belt.

I submitted a ticket 3 weeks ago and still haven't heard anything. Since then I've tried: adjusting the belts, moving the printer to the floor, running resonance tuning, using PLA vs PETG, and printing different models. No solution as of yet.

I got the microcenter warranty so I'm wondering if this is worth swapping out for.

Thanks in advance.