bought a 1.6 A3 petrol

done 99000 miles

gearbox changed 1000 miles ago

i changed the alloys from 15 to 16 inches (off ebay) original 5 spoke

drive shaft broken 3 times since changing wheels after 20 to 30 miles

suspension already been lowered on car anyhow

Does anyone have any ideas why

car nevver been in an accident

please help