Apple TV wifi connexion gets extremely slow in 1 day. Reboot solves it...

Hi,
I have an ATV 3. The setup is simple, no jailbreak. Connected on an impressively fast wifi N connexion. Logged in my iTunes account, with Home Sharing with my MacMini, always on. ATV set up to never go into sleep mode. Airfoil on my MacMini and streaming the sound of ATV into Airfoil by Airplay (tried to deactivate it and my issue described below is still here).
Now, when I start my ATV and stream an iTunes TV show I bought (not through HomeSharing), it's a perfect experience, the playback starts in 1 sec, 1080p, wow.
The next day, I do the same thing, start streaming a show on iTunes (not through HomeSharing), and this time, it says the show will start in 33 minutes!!! I reboot my ATV and it's blazing fast again.
I've had this observation maybe 10 times, tried different things, including the 'never go to sleep ATV setting' thing...
ATV is great but if I have to unplug and replug it every time, it's a real pain!
Any idea? Someone already experienced such things? (fast connexion at first, then extremely slow the next day until unplug/replug solves it)
Thanks a lot
Cédric

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