Why doesn't my car clicker work in Southern California?

I have a Ford Explorer Sport 2002 and I live in Sacramento. My clicker works fine and I can lock, unlock or set off the horn with it.

Strangely though when I drive down to Southern California it suddenly stops working. I've never had any issues with it unless I've driven down there. As soon as I get back it works normally again.

Has anyone heard of this? I'm assuming it's some kind of interference but I'm just curious to know more.

Thanks!
 
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