My girlfriend has an unrooted, un-messed with S4. Recently, her wifi has been unstable, she'll be reading stuff online or watching a video and the wifi just stops. no webpages will load, videos stop streaming. A minute or so later, it will be fine. During these periods of instability, my Note 3 loses no connectivity on the same wireless connection, and neither does my laptop or any gaming consoles. It seems to be just her phone. I began happening about a week and a half ago, and we had not done any software updates or installed any new apps. What could it be?
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