Hi, I went to the genius bar last month (23rd) because i had a piece of dust under my screen, the speaker was making a weird noise and my signal frequently dropped. Anyhow they replaced it. Now near a month later im having more problems :/ . When im on calls, i can hear my voice echoing loud and clear, just as if i said something twice but the other person could not hear it. I replaced my sim twice, did a factory reset and still nothing. It also gets so hot in the upper third of the phone that i have to use my iphone 4s out of fear of the battery exploding! It is an iphone 6. What can i expect today at the apple store?