AV8R Stick new and failed already

[SEE]

Arrived today, worked fine for an hour or so, just booted the xbox up and the controller trigger (A) is either on all the time or does nothing at all.....peed off but before I ring and scream abuse to the retailer is there anything that I have missed or got wrong? Using it in Mode 1 and booting up with it connected to the USB port. Checked it on the PC using the MS drivers and exactly the same.