I am having the exact same problem, and it is horribly annoying.  And, it is in fact "Verizon Location Agent".  I have only had this phone for about 30 days.  Because of this problem, I am now missing important calls.  This is completely unacceptable, particularly considering what we PAY Verizon for these services.  Right now, this phone and the Verizon service is completely useless to me.  I need this to be fixed by Verizon immediately, not a work-around suggestion involving turning off services that I pay for......!!