Goldcoins mining problem

[specgamer]

Here is what happens:  I'm mining Goldcoins (BFG miner) on my crappy laptop.  Getting 50KH/s - 60KH/s in the begginning, but every second it drops by like 0.5 KH/s.  What is happening?  In a minute or two, the KH/s rate is so small, or at zero.  Help???