Sure, chances are it will happen again. I know that black artifacts will show themselves depending on the values you input into the hairshader as well. So may help to see your material graph as well so I can match your settings.
If you are interested here is another bug I put in for the hair shader: Unreal Engine Issues and Bug Tracker (UE-39061)
The backlighting is very bright on the hair and looks incorrect. This is why I think the light settings could be related as well.