X Axis Skipping on print Startup

Hello

We have an odd problem with our ratrig vcore4 hybrid.
About every second or third start of a print there is a audible buzzing noise and steps are skipped along the x axis. This happens only during the start print macro right before the priming blob.

However wierdly enough it doesn't seem to be a general problem with the belts/steppers. We can drive them very quickly at velocities up 700mm/s an 15k accels (didn't test more) without any skipped steps. The path is also free from any obstructions.

Sadly I don't have a video of it.
Any ideas what could be the cause are welcome! Thank you very much!

Solution

In case anone was wondering: We were able to fix the problem. The issue was the lower belts being tightend too much. Loosening them fixed the issue.

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