How can i fix my DJ Hero turntable for ps3?

[FreshMoney]

Whenever i play DJ Hero i always have a problem. I try and hit one of the color buttons, but when i do, it registers as more than one time. So heres an example; the song goes red blue green. When i press it correctly, it says i pressed red red blue blue green green green or something like that. As you can see it is impossible to get more than 2 stars. please help me, i am no longer under warranty and i already tried new batteries.