I'm getting the same two issues. I turned off my wifi (so I could use data period), then turned it back on. When the security warning came up, I turned Wifi off, then went through the security update process. That cleared that. Buy my wifi keeps connecting then disconnecting, telling me that the connection is unstable. I went into advanced settings and turned of Auto network switching, and at least I can connect to Wifi - but I have to turn Wifi off when I leave the house to get 4G service. At least it isn't killing my battery as fast though. HURRY UP VERIZON/SAMSUNG!