I feel like I am going crazy... but I swear, right after installing Yosemite on my nMP, my wifi connection to my Apple TV has degraded beyond anything usable. I am not talking about Airplay from my nMP to my Apple TV, but just straight up native Apple TV apps, like Youtube, Redbull, Netflix, etc... My Apple TV is basically unusable at the moment.
I have even turned off wifi on my nMP and am using wired ethernet straight to my router (Netgear N900), however after installing Yosemite, it was using wifi for a while before I turned it off.
It could be that my local AT&T headend has just reset all their switches, or some CDN network just rebooted, or something else really strange - but I have never ever had issues with streaming from N900 to my Apple TV prior to this (I have 12mbs DSL).
I have reset both the N900 and the Apple TV and everything is still hosed. I really don't see how Yosemite could be causing my issue, but I saw this thread of all the other wifi issues and it just started making me wonder...
Edit
I just shutdown my nMP and reset my router and streaming is working again on my Apple TV. I don't have separate SSIDs for my 2.4 and 5.0 networks so it's hard to diagnose the issue with my Apple TV but it's working perfect now and just 15 mins ago it would not stream anything