Caulk on countertop
I have a formica countertop with a backsplash. Where the backsplash comes together with the wall, the caulk keeps cracking and pulling away from the wall. This countertop was installed by a professional. He has redone it twice now and he says it is because it is on an outside wall and the expansion and contraction is causing it. However, the old countertop never did that and there is a side that is not on an outside wall that also is doing that. Can anyone advise on this matter?