+1 for letting the LBS evaluate. It may just need a good tune-up.
You may also want to consider swapping to a rigid fork. If you're running at least 1.5" tires,you'll have all the bump dampening you need without suspension,plus you'll save weight and gain some pedaling efficiency.
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C'dale BBU('05 and '09)/Super Six/Hooligan8and 3,Kona Dew Deluxe,Novara Buzz/Safari,Surly Big Dummy,Marin Pt Reyes,Giant Defy 1,Schwinn DBX SuperSport,Dahon Speed Pro TT,Brompton S6L/S2E-X
