I'm (iPad 4) Jailbreak on 8.1 with the latest Pangu. Every once in a while the iPad crashes, such as a darker non-responsive (slide to unlock does not work) screen. I then hard reset. When the iPad comes up, I am still on my WIFI, but without bars. I then check and I have a 169 (private) IP. I then "forget" the network. Because my SSID is hidden, I shouldn't even see it, but the iPad does. I then re-join the network by putting the password in. This has now happened 3 or 4 times since my jailbreak. Is this a Jailbreak or IOS 8.1 Issue?