I'm relativley new to biking, and have just purchased a Fuji Touring bike from a local bike shop. It came with a Shimano Deore rear derailluer. Since day one it will intermittently want to shift out of a gear, and sometimes actually shift to a different gear, the LBS has replace the end tube shifter and just recently the rear derailluer to a Tiagra. The problem happens very randomly I can ride 15 miles no prob. then it goes wonky, then smooths out and it might be 5 or 20 miles and happens again. it only happpens in the higher gers on the cassett (7th and 8th 90% of the time) It has never happend where the LBS has seen it, and he has been extremly obliging to me. Has anyone had or heard of this problem? Soultions? I bought the bike for health reasons, it is to the point where I dont even want to ride. When the bike is not wonky I LOVE it.