My iPhone 6 8.1 connects to WiFi and is always stable (always shows connected), however, randomlly the internet will not work for a second or two and I'll have to reload the web page, or close the app to get it working again. This happens periodically, and can be often seen when I'm going to different websites during the same session of time, or streaming music and going to the next track multiple times. The wifi stays connected, but the connection cuts for a second or two even though my phone still shows connected. It's not a router problem either. Is this hardware or software? i've tried resetting network settings.