Why does my phone ring once for no reason at all?

I have a GE cordless phone. About every third time I use it does this irritating thing. Immediately after I hang up (or more accurately, push the button to end the call) it rings one time.

No one is ever there, it’s not a real call… just a loud freakin’ ring. This is especially a problem when I’m talking to my girls at night, right next to my sleeping husband. What is up with that? What could be causing it and is there anything I can do to stop it? Neither of my other two (Uniden) phones has ever done this.

NOTE: This is my bedroom answering machine/phone, and I really don’t want to replace it.