Using 2 ATV2 off a 2009 iMac. Never had an issue before. Since upgrading to 4.3.1 the ATV2s will forget home sharing. They can see the computer but it appears that no content is shared; this happens every other time they are booted up. I have to turn off home sharing in the menu and turn it back on and the computer's content is available again. Anyone else seen this?