Oh no.  I was feeling so good about my Avalon Nano 3.  Now as I sit in my office I can hear that the fan is quite a bit louder than it originally was.  Sounds like maybe a ball bearing is going out already.  I picked it up and it sounded like things were moving around in there.  I'm not going to touch it again and I turned it down to low speed in hopes of keeping it alive as long as possible.  I'm going to try removing the plastic grill like you mentioned in another post to improve airflow and maybe if that helps out I'll try it out on Medium again.