We have had our granite countertops about a year, and the caulk where the counter meets the backsplash, shows the caulk pulling away. This is mostly in our master bath and I am wondering if it is from humidity. Is this normal? My granite installer told me that this is not covered by warranty but the price to re caulk does not seem to bad. Is there any way to make the new caulk job we are going to get last longer than a year?