Suddenly getting swirling noise artifacts in background

UzHIoL3s

I've been happily using my S30 for about a month, and it has been perfect! But a few days ago something changed in the captured images: swirling noise artifacts.

It appears with/without LP filter, with/without dew heater, aimed at north/south/east
it's not stacking artifacts, because I've stacked with the Seestar's deep sky stacking, Siril and Affinity
it's as if the noise is no longer random but creating patterns (before, the noise used to be perfectly homogeneous)

If I had to guess it's an issue with the dark frame, and/or the scope is no longer dithering?

Is there anything I can try or reset to fix this?

Support@Seestar

It looks like the issue may be caused by insufficient dithering, and there seems to be noticeable field rotation. （But this is not necessarily the problem, we need to analyze the logs.） Could you please log in to the Seestar app using your email (without turning off the device), then follow this guide https://h5.seestar.com/course/79221 to submit a log? Be sure to describe the issue clearly and check the "Add log" option. After that, please send us the log ID so we can analyze the cause.

UzHIoL3s

Thank you very much for the quick reply. I have posted the log under #BT20250429022343S

Indeed, field rotation was my first thought, but has not been a problem so far and it would be illogical if the noise in the center of the screen would suffer the most from it.

The issue seems to be that the noise is no longer evenly distributed but forming patterns now. And due to field rotation these patterns are becoming noticeable when stacking.