Recently my 2007 CX-9, luxury package AWD which I bought new, began having problems with the keyless card and is totally unreliable as it does not always (70% of the time) open or close the doors or even start the engine.The dealer ordered two new sets of cards, had them reprogrammed but to no avail. I have tried with new batteries also. The dealer is consulting with Mazda tech but has had no answer from them yet after two weeks waiting. In the meantime I use the metal key to get around. The dealer initially thought there could be interference coming from my cell phone but that has been disproved.