How often to disconnect from shore power

I just want to add that I have no access to the RV while in storage as I would be out of state that is why I am asking all these questions above ... also, just in case that is a factor , I live in south California , so hot dry weather most of the year. I usually hook the RV between November and May, then leave it in storage from June to October, every year, for the last three years and counting.