I use the Otterbox on my IP4 when at work. Usually I take it off when I have my 3 days off or if I'm going out somewhere. So that's most likely around 3-4 times a week I take the case off and put it back on later. It seems the rubber that goes over the hard case it getting kind of lose fitting. I notice it at the edges and especially feel it on the back near the Apple logo. Is this normal? Do they sell just the rubber cover by itself at any local chain stores? Anything I can do too shrink it a little, like leave it in the freezer overnight?