Originally Posted by Weasel

Since it is so hard to reproduce, and since the system has such a low capacity to begin with on the X5 (0.98 lbs) the best first course of action is to just have it recovered/measured to see how much is in it, vacuumed then refilled to the proper charge level via calibrated machine. Nowadays all the dealers have the computer controlled machines that do everything for you so almost any tech can do that without botching the job.

If for some reason that doesn't fix it, I'd look at the evap case around the temp sensor to ensure the sensor isn't getting any air leaks from outside the case making it think it is warmer than it is, as that could allow the system to run it too cold.