Hi: Had iPhone SE for few weeks now. Starting just this week, iPhone SE will crash when unplugged from power source (white screen with black Apple logo). It happens randomly and has occurred 3 times now. Secondly, the WiFi seems need sometimes to work. This connected to WiFi network, but there is no connection for few minutes. iPhone SE seems take its sweet time to get network established. Once it does work, everything will load fast. But it gets annoying is that it take few minutes to do so everything unlock the phone. Anyone has the problem?