I am having the same problem with my s7 edge, I was on the phone with Samsung tech support today for at least 20 min and they are no help!!! I've done every trouble shooting step including the factory reset...quick connect either won't connect to my device or if it does connect the connection is dropped within 30 seconds or so. I've even replaced my Screen Beam mini 2 to see if that's what the problem is, it's not! My phone had been mirroring perfectly until about 2 weeks ago, it seems like it's time to switch from Samsung they offer little to no answers on why their expensive devices don't function properly!
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