My service shows that I have used 5.3G of the 15G monthly available , in one day. We are a lightweight, older couple that use the computer for e-mails, banking and occasional shopping. My average prior to this date was 1M per day. What would cause such a large jump in my usage? At this rate we will use up our entire month in 3 days. There has been no additional equipment installed, but we did do the Apple upgrade during the off peak hours 5 days ago. What is going on?