I just got a Miacup and I'm wondering if anyone else who has one could tell me if theirs is the same. Or if anyone thinks it is an issue. When I squished it together for the first time I noticed that there was a crackling sound and I thought maybe it was because it was sticking to itself. I squished just one side of the cup in different places between my fingers and still heard the crackling. It's as if there are bubbles inside (I don't see anything cosmetically wrong with it). Is this normal for the Miacup? If not, do you think mine may deteriorate faster?