Power Locks

I have a 99 Astro with 103k miles. I live in sunny HOT California. Ever since the hot weather has set in and after my van has sit in the heat all day, the power door locks have started to accuate (lock and unlock) until I take the fuse out or the weather cools. This usually occurs when I start the van and drive eight miles to my home. Sometimes it will even do it when I am outside the van etc. This is a GREAT board and I learned much and hope to be able to contribute.