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Oneplus 3T wifi problems

Just got a brand new shiny Oneplus 3T midnight black edition and I'm having issues connecting to my home wifi network.

 

It connected fine the first time. As soon as I go out of range and return (go to work, connect to wifi there, come home) it won't let me connect. I just repeatedly get the "Sign in to a wi-fi network" message. On the wifi settings it says "Connected, no internet"

 

I thought I'd fixed this issue by restoring my phone to factory settings, but it's persisting. I've also tried disabling 5GHz, changing the 2.4GHz the g/n only, setting a static IP, and rebooting my router and phone.

 

Going a bit insane since I live in a place where 3/4G is pretty non-existent, and I really love this phone aside from this one issue.

 

Any advice?

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What version of OxygenOS are you running?

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Android 7.1.1, Oxygen OS 4.1.3

 

The phone asked me to update to this when I powered it on the first time.

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Possibly solved...

 

Turning off 'Smart Wi-Fi switcher' in the settings has fixed this (for now), but I'll test again tomorrow just to be sure.

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