A stage 4 clutch is not for the street. You have a way too aggressive clutch in there and it won't last on the street. If its been in a year, best guess is it's toast, and I'm surprised it made it that long. You need to use the right clutch for what you have, and a stage 4 is for racing, ie it is NOT for the street in any power range. They are made to launch hard and engage quickly, they will burn up under regular driving in no time. IMO zoom clutches suck to begin with, but any brand clutch that claims to be a stage 4 or other type BS is not for the street. You can try adjusting the cable and looking inside, but if its slipping I would think its going bye-bye.
The artist formerly known as SteedaMatt.