hmm.. does this acure when you are in partys? if so then it's a partymember of you that is doing calls (command for example: <call15> ) if not ... Make sure you don't have any messages, no pending friends requests and no un-opened mail) (at your connection icon ( upstream and download thingy) does that switches to another icon ? Message icon ? if so you might have some e-mail somwere..
I hope this got you anywere! if not just try mailing Squaresoft or if it's getting anoying call a GM