Ever since the update, 90% of the time after turning off my xbox, it turns itself back on. Sometimes immediately, sometimes it will wait a while and then suddenly the little power light turns on. There has even been one occurrence of the console having been turned off, stayed off for at least two hours, then after leaving the house for an hour I return to find it on yet again. Its not like the controller is getting hit, it never connects to a controller when this happens, and we make sure to place them away where they won't be activated inadvertently. It seems to occur most often when using the popup menu to shut down the xbox.