It didn't happen the next time. I just got no charge and no echo either. That's why I posted here.

Also I've got more than one charge per kill even with the recent lack of charges, so the people I am killing are not crap as a whole. Those worth lots of charges who are in my range haven't been around at the same time as me recently. I'm not going for weak victims by choice right now. It's them or no one.

Anyway, thanks for the answer. I'll just go back to assuming everything works like I was doing before.