I have iPad 2. When it goes into sleep mode, the wi-fi disconnects. When I open it, it takes few seconds to connect to wi-fi. I googled the issue and read somewhere that this preserves battery life. Some apps that use require Wi-fi for push notifications. When I open the iPad, I do get my Push notifications but the latest ones only. For example, during the time the iPad was on sleep mode, one of my game app sent me a notification; after a while there was another different notification from the same app. But when I connected to the wi-fi after, I only got the second (& latest) notification. I never had this problem before the ios 6 upgrade. I did recently upgraded my router. Is it related to it? Is there a way to fix this Wi-fi disconnection in sleep mode? I want it to stay on all the time.