losis wear fast because of their design. When you use a bone like losi does instead of a true cvd you can twist the bone 45 deg. when it's at an angle and it will often times be sitting at 40deg. on the other side. Then when you spin it to 110 it very well may be sitting at 115 on the other side. It is just the nature of the design. Since these pins are acelerating and decelerating greatly every rotation it will add more wear to the buggy. Once slop has become noticeable in the drive line these fluctuations will become much more minimal.