This is an often-asked question that can have many answers. I'll try to touch on a few more common things to check when your broadband slows down. (Keep in mind it could be your 'computer' that is slowing down and 'not' your broadband connection)
The first thing would be to run an online speed test. This helps to get a general idea of the current speed of your internet connection. It's ...

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i find that my isp slows down now and then?? Ggrrrrrrrrr

my so called bb speed is 8kB/s

Ist check that ur computer is virus free. also check about the programs that communicate to internet when u do it. it can be found by using netstat command in dos.