IPhone 5 Dynex charger problems?

I went to Best Buy to buy a new iPhone 5 charger because the one from the Apple store of course broke. Now it works great but if I move it the slightest bit while it's charging it stops charging and says "This Accessory May Not Be Supported" why is it saying this? Is there something to be fixed? It's brand new. And if it does charge without being disturbed it charges really slowly.

When using a third-party charger, you will often get this error ever since the update to iOS 7

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