[flouese]

Went to the local grocery store for a few items. Since it was a hot day, I decided to take the Box with the top down. Made my purchases and was away from the car for about 2 minutes. When I came back, inserted the key, it would not turn! I said to myself, self' OH CRAP". After a whole bunch of Sailor words your mother would not want to hear and a lot of jiggling the key around, it worked.

What would cause this??? If it happened once, it's going to happen again. Any thoughts, corrective actions?