This past week has been horrible with every scene consisting of trails rendering as hair has crashed a lot and had many frames with artifacts. We use x-particles trails, but it also happens when they are baked to alembic.
It happens in different scenes, on 3 different machines with different OS (2x win10 and win 7).
Octane 4.05-R7, C4D R20 and R21
It happens in both complex and simple scenes.
Here are some examples:
Bug report from recent crash:
What to do? I can't go back to Octane 3 (this scene rendered just fine couple years back).