Until a patch is released to correct this problem, I can confirm that the following workaround will temporarily alleviate the issue: Select your Settings app. Choose General>Sleep After and change the option from 15 minutes to Never. Once this problem has been patched you may want to change this back so your Apple TV will go into sleep when it is not in use. Otherwise you can manually put it to sleep by long-pressing the TV button on your remote and choosing sleep from the pop-up menu. Thanks to @zammikiel for posting this workaround.
... View more