I got my 6 Plus in December 2014 and the WiFi was working great at home. I connect to 5Ghz network and no zero "spots" at home. I use Time Capsule and there has been no changes to the network settings. Fast forward - a couple of weeks ago the Wifi suddenly acting up. I can see full bar but ANYTHING that requires network connection will stall - Safari, Mail, 3rd party apps, etc. This is very intermittent: sometimes I got awesome connection, but most of the time I got nothing. If I turned off WiFi and switched immediately to LTE, everything came back alive! Fast browsing, great speed, etc. I tried resetting the network setting in the iPhone, reboot the iPhone, reboot the Time Capsule and router and it doesn't do anything. Is my WiFi chip broken?