Mine locks on recirculate after 3 secs. Drive yesterday and at around 15 mins a warning came up. Left it on for another 15 mins. Switch recirc off and it clear. The warning did not deactivate the switch....but I suppose it reminds you that if the road is no longer dusty in front you can switch it off.
With the 200.... I can also speak from experience. The one I travelled in for 500kms....I needed a mask. No matter what we did we could not stop the dust coming in. My brother traded it on the return to the dealer. The dealer told him that it does seems to be a problem. He now has a D4.

