OK....maybe I am crazy. I keep hearing sounds. Not an unpleasant sound, but annoying in that I cannot find where they are coming from! It's a steady rise in pitch of 4 or 5 tones that lasts only a second. Like most of you, I am surrounded by electronic devices and are familiar with most of the sounds they make and what they mean. I have never heard this one and through a process of moving things around the room...it appears the sounds (occur at random with sometimes seconds between them....sometimes an hour or more) are coming from my Cisco Linksys E1200 router. So my question is....do routers have notification sounds? Because I have never had a router do this before. And if so....what is it trying to tell me?