I live in Sacramento, California where the summers get quite hot. At the end of last summer I started having an intermittent problem with my driver door's power lock not working. I noticed the problem occurred on hot days over 95 or when the sun was directly hitting the driver door. No problems all winter and up until today when the temperature reached 98. Neither the key remote or interior buttons will lock or unlock it. The other doors work fine and the key in the door works fine. Any ideas? Thanks. 1999 LX470