I have recently purchased a 2010 323d with about 2200 hours. When raising the boom or tilting the bucket everything moves smoothly, but if lowering the boom it will hesitate then shake, or drop quickly a few inches then lower smoothly. If I keep steady pressure I can smoothly lower the arms but if I stop and try to lower the arms it will drop again before lowering smoothly. I have used this machine in the past before I purchased it and it was always smooth. I have verified hydraulic oil level but really am not sure where to go from here. I wasn't sure if there was something I could check or if it needs to be brought in for service. Any advice would be helpful as my wife was both thrilled with the purchase in the first place.....I fear I will be sleeping outside In the loader if I have to bring it in for service already ????