We turn our modem off when we are not using the system. We have very good reasons for doing this, and our installer absolutely assured us this would not be a problem! However, our data did not reset two days ago at the billing cycle. It still shows *all* last month's usage (5.6GB), and the amount showing available is still 14 GB (our 10 GB plus the four GB "extra" we received after we reported unidentified data usage we were sure was not ours, coincidentally, on the first day of the *last* billing period). This month, we wanted to be absolutely sure there were no first-day issues, so we left the modem off for another day! However, when we turned it on, we found no usage (and my router monitor confirms this) - but also no data re-set. What's up?