Googlemap api sometimes shuts down

Question

im using googlemap with javascript,

I turned on every google map service and I got the api key from the browser, set the http links as "abc.com" and "abc.com/*". Then I set src as src = "http://maps.googleapis.com/maps/api/js?key=abc&sensor=false"

everything worked in the first hour, then I became unpredictable .. sometimes it works, sometimes it does not work, and the error message "Google has disabled the use of the Maps API for this application."

however, after i refresh the page, i will work again..

it makes my site so unprofessional, someone plz give me a solution !! thank

considers