this may happen because ur connectino isn't full 2megs, u have somethink what they called Contention Ratio 48:1 or 24:1, which is more less mean U R sharing ur connection with other users,
the other think is depance which area U living, because some
IBB transmiters R overload and then ur connection wont B stable.
The best think is check ur connection by computer, try to run few broadband tests, special evening time when most people b online, if b crap start complain
