it seems ur weer downloading sotttents..
some times the data just strukked somewhere.. b/n the donner n reciever end.... and reached at once. so it just teh same case happen with you.
to veyfy it take a test. if ur using Utorrent for downloading.....
limit your download to 1kbps or somethign for 2-3 minute...... the moment you make it un-limit u can see the download speed shoots up to someting 100Kbps or so ...... dont worry everythin is working as it should
I'm in the home699 plan and this already happened thrice with me that (once during day and twice during night time) my 128 connection was converted into a 512 one . dwld speeds shot up frm 12 to 60 KBps and this was not for 1 or 2 mins but for about 30 mins this first two times and last time it lasted for almost 3 hrs .