I used to own a HF helmet that had the replacable batteries/solor and it worked great so I recently picked up another on sale, however, its only solar powered and I've been reading some people have had some probs with them. I even tried leaving my helment outside all day to charge up, but that help any. I'm gonna go return it for a battery powered lid and see if that helps.
What makes my issue so frustrating is that it is intermitent, it happens with both finger/pedal control.
I'm hoping its just a faulty helment, but i'm gonna feel like the biggest idiot if it is...