BCN Mining help Please

[thirdchance57]

I have been mining BCN with my computer for a bit now and I notice that my rate jumps around from 30H/s to 96H/s down to les than 10H/s.  Can someone explain to me why this is happening.  I am also looking for a mining unit that I can use to mine BCN constantly. I just would like to get somewhere around the 500+ H/s rate or even higher.