Hi gavs,i found u commented on other thread a yr ago.which is exactly what my car doing now.
Newish 2012 VW Polo GTI Problems
Fabia is also a platform generation behind the polo.

I you have a rattle going over bumps that is also present when the dsg changes gears, take note of which gear you are in. You will more than likely find that the rattle you are talking about is the standard DQ200 3rd gear selector rattle. Perfectly normal to occur (when in D) in 2nd and 4th gear and when in M it will occur in 2nd, 4th or any other gear that the dsg deems to be too tall and will pre-select 3rd gear.