Arrive makes random beeping sounds

[imecoli]

My arrive has recently started to make random beeping (tone like) sounds, 3 or 4 at a time. Each one is a short tone and is coming thru my speaker. I dont know if this is an error code or what. Has anyone else experienced this?
I dont have a whoe lot of apps installed, and I havent installed Mango. Sometimes it happens when I am performing a task, and other times while it is just sitting.