For those of you that own a grove case (bamboo case) for the iphone 4, have you had any reception issues? There was another thread called "My Grove Case" where the original poster ended up returning the case because he claimed it "made the phone flatline". I haven't heard of anyone else having reception issues, but it concerns me as these cases aren't cheap, especially since I'm getting one with a custom design. Could you please share you experiences with the case?