Pivot bearings do a thankless job as most of us forget that they exist. They need to be replaced just as you would replace a bottom bracket or headset bearing. Neglect could result in a poor performing suspension or even result in damage to areas in your linkage. When you buy a new bike, it feels smooth and your rear end tracks well over varying terrain. We have seen pivot bearings destroyed in as little as 9 months however the typical replacement time is at approximately the 2 year mark (depending on trail conditions and use). Have one of our service technicians to inspect your frame to determine if you need a pivot bearing replacement.