I've had my D3200 nearly 3 years, the auto focus has stopped working luckily it was still covered under a breakdown warranty I bought with it so has been sent away for repair.
A couple of months ago my sons bought me a Tamron 50-200mm lens which I have been using a lot recently, just wondering is it possible the new lens could have caused the damage?
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I've seen no other news of Tamron (or other brands) killing the camera's AF, as they're pretty careful not to do something that would likely kill the brand, so I'd not worry much.