Hey there--
We're a school which has gone all-in on Aruba, and really loves it. Hand in hand with that, we've gotten Apple TVs in our classrooms, connected to projectors, specifically for screensharing (although some teachers use their other abilities curricularly as well).
Our teachers use Macbooks Pro of various vintages, though none are more than two years old. They've all been updated to the latest software. And we're using Aruba6000-US controllers running 6.4.0.3 to drive a network mostly consisting of AP-105s and AP-115s. We use Clearpass Guest with Airgroup to allow access by role to said Apple TVs.
We're finding we have a major problem with the Apple TVs dropping screensharing connections -- sometimes five times or more in a half hour. And, we've found that it's difficult to predict when it will happen.
From what I've been able to gather, part of this is a problem Apple needs to resolve. However, the problem has worsened over time, which makes me suspect there's tuning I can do to settings or to the Apple TVs to reduce the issue.
To make clear, by the by, other Apple TV functions -- such as streaming media from the internet -- work without interruption. And, also to make clear -- we've seen the problem from iPads as well. It's not specific to OS X. We just don't use iPads very much curricularly.
RF interference seems minimal, by the by, and does not seem to be a precipitator to the problem.
What can we do to tune our network or otherwise reduce drops? It's the one black eye our wireless network has. Do other folks have tips or tricks?