Bad image resolution on TV when mirroring.

I have AppleTV HD and Macbook Air (OS10.8.1). Mirroring worked pretty nice for 3 months, but recently the image on my TV started to have very bad resolution and slow response to image changes. I checked out all wires, internet connection, reset all devices, including TV multiple times. Nothing helped out!
Any advice?
Thanks!

Found the answer which worked for me:
jonvid
This solved my questionRe: No Audio when Airplay Mirroring from Mac to Apple TV
Aug 5, 2012 9:42 PM (in response to tdnorton)
I had this same problem and I think I just found a solution. Turn on your Apple TV. BEFORE turning on the mirroring, change the output audio on your computer to Apple TV in System Preferences. After that, turn on the mirroring and the sound should be coming out of your tv."

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Changing the way data tips are rendered in when mirrored.
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