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Just upgraded to a 6s from an iPhone 6. I'm on iOS 9.2.1 and notice over the first few days of use that the wifi signal will fluctuate from full signal, 3 bars, down to two bars for a second and then jump back to full signal.
This never happened before on my iPhone 6, just want to see if it happens to anyone else? I've reset the network settings on the phone and reset the router too, but didn't fix it.
Anyone experience this too? Never had this on any of my iPhone's in the past.

Thanks