I have Mavic CXP 21's with 32 spokes on my bike. The bike is almost new (about 100 miles on it) and I have the wheels go out of true on every long 25+ mile ride that I have taken so far. Once I was able to true the wheel myself on the road and get it close enough to get home on. At that time I noticed a couple of loose spokes one was so loose I could turn the nipple by hand. I tightened that spoke and the others and that helped a little. The next day on a 25 mile ride on reasonably good roads the same thing happened and the same spoke(s) were loose. This time I took it to the shop and they trued it. They thought it would hold up fine but yesterday while 30 miles into a 42 mile ride, both wheels went out of true. I had to back off the brakes so that the rime would not hit. Well I returned the bike to shop and asked them to correct it. The tech said he would do the wheels over and apply loctite (then he corrected himself by saying spoke prep) to the threads. My questions are as follows, I am heavier than the average rider 220lbs will these wheels hold up in the long run? Should they use loctite it seems to me that that would make it very difficult to turn the nipples in the future? I have been riding most of my life and I try to ride as "light" as I can so I dont think its my riding style, but I guess it could be. Any thoughts??