Data gets eaten fast

<p>I have a problem - always with 1GB.</p> <p>Uploaded data at 08:31 and with in a few minutes all 1GB was used. I did not even have time to click the mouse to open gmail etc. Was waiting for the ****le and it displayed " out of data". all gone by 8:36.</p> <p>Each month this happens as I run out of my 3GB data bundle, I load a further 1 GB and it gets used in no time.</p> <p>How can my average usage on the same laptop be 3GB = 3 weeks. Then 1GB is 5 minutes???</p>