The standard Bosch DV is prone to failure and breaking as it uses a cardboard diaphram!!
You would be best to change it, i have a Forge Motorsport 007p Recirc valve on mine which has a spring loaded piston that can be changed for different boost depoending on remap and it works sweet
You can get one cheap from these guys
Awesome GTI Store UK - Audi A3 8L1