I received the 6 foot PowerLine+ Lightning Cable in July as a member of the Power User program. It's been working perfectly on my iPhone 6s since I received it. This morning, I plugged in my iPhone as I always do, but it wouldn't charge my phone Ive always been completely confident in Anker products, so I became worried it was a problem with my phone. I grabbed a different cable to be sure, and my phone began charging without issue. That said, it must be a defective cable. However, having received it for free, as a power user, is it still covered under Anker's warranty?