Hi, The front wipers on my 2004 2.0 TDI sport A3 are acting very strangely. When I turn them on they work fine for as long as leave them on. If I turn them off they will not switch back on again until I have parked up and switched the engine off for about five minutes. If I turn the engine off for a second (eg running into a shop, posting letters or even stall the car) they will not switch back on until I leave the car turned off for a couple of minutes. I have had the bonnet catch replaced but this didn't cure it. The car doesn't have rain sensors but the wipers do automatically slow down when I am in traffic or at lights etc. I don't understand how this could be the leakage or motor because the wipers will work fine on full speed for hours. Any advice is much appreciated. Thanks, Adam.