I saw a few people have been experiencing "tunnel" sounds. Is that from the pad next the microphone sliding? I bought my case at Best Buy, had no problems from day 1 and then this week everyone started to complain I sound like I'm in a tunnel. I'm going to exchange it tomorrow and see what happens.
Same with me. It was fine when it was new. I went thru three cases. My advice is to just return it for a refund to same you the time and hassle.