I found out that there is no problem when I render a fragment of one camera within the camera cut, and the hair only gets buggy when transition between cameras is happening, although nothing happens to the character at the moment of transition, the camera just changes.
Camera cut warm up doesn’t help either.
So I guess the workaround solution is to render each camera separately. I hope this will be fixed in the future.
If that didn’t help for others, you should try something from these options:
Turn off Hair physics if you don’t actually need it and just need static hair
Try disabling Motion blur, I know cases when this helped with Cloth and Hair simulation. If you need Motion blur you can add it later in the post production in Davinci/After/Premier etc.
Try adding Engine Warm Up Count or Enabling “Render Warm Up Frames” inside Anti-aliasing settings in Movie Render Queue. Also try high Warm Up numbers like 300-600
Try Disabling/Enabling Override AA checkbox, have multiple cases it helped when Disabled
Try not using Anti-aliasing at all, see if it works without it - not the best workaround, but if having AA isn’t crucial for you, you can get rid of it if it is helping
Try “Go to the Hair Physics in your groom. In the solver choose “custom” the re-choose the correct solver example:spring”