Ducati Sporting Club UK > General > Idle Chat > Small problem with me' bike.....Help please.

hi all,
I just had my nc30 serviced and since then it has covered less than 300 miles......And now after 15/20 minutes of raggin the bike....when i let off the throttle and then on again....the bike seems to bog down for about a second or 2 then accelerates like normal...and it gets worse and worse....Its ok if i give it 75% throttle but when opening it up fully it bogs down.
then when i start it up the next day and ride to college...its fine but im not actually raggin it because its busy traffic,cold engine etc but it doesn't bog down at all.
Help!
what could it be?

[Edited on 4-2-2005 by Jewell]