@beastman Hummm ok. I have an access point connected to a Cisco router for the wifi traffic, it supports N, not AC. I have tried with an Apple Airport Extreme as well, but again 802.11n. I could try something with AC and see if the Apple TV is happier with that. Thanks, did not think of this as an issue. Cisco Aironets are not cheap though. Will see.
@Tom_C Thanks, I hear you. My router reassigns the last ip is the leave recently expired or if the lease has not expired yet. So in my case it automagically gets the same. The advantage I find in fixing the IP is if you are trying to directly access that device from the outside, is a PAT or NAT rule exists.
It's easy enough to try if all else fails. I will see if I can borrow an AC router first to test the theory out.