I am pretty sure what's causing this, but wanted to see how common it was. I just got my replacement Eris a few days ago and it seems to be new. Everything on it works great. However, there is often a buzzing in the earpiece when people are talking, especially when the volume is at higher levels. It just has that sound of a slightly loose speaker or something. I hate the thought of going through the return process again and it's not hugely annoying but I wonder if it will get worse. Anything else that might cause this? Didn't have this issue before. Seems tough to get a perfect phone. If it's not one thing it's another.