Loving my Lumia 900 so far, but I'm noticing a problem I have during calls. Multiple people have pointed out to me that when they're on the phone with me, they hear their voice echo back to them. After a few people told me this, I asked my roommate to call me and tell me if he heard anything when he talked. Unfortunately, he did. I borrowed his phone for a second and heard the issue firsthand. It sounded like my voice was sped up (like a chipmunk) and then played back in my ear. Does anyone think it's related to the data connection issues the phone had when first released? Anyone else having this problem?