Batiste dry shampoo - can stops working after a while?

[ToothGah]

This is the second can I've found has been really powdery and effective to start with, and then around half way through using it it stops putting out as much powder. It still feels like it's half full. Have tried rinsing the nozzle but it didn't help.

Anyone else found this? I emailed Batiste and to be fair to them, they offered a full refund if I sent serial number, place of purchase etc, but DP threw it out as I'd left it by the bin.

Getting a bit fed up - the Poundland one definitely works better!