phone will not connect to WiFi

Hi, my phone is not connecting to WiFi
It was fine to start with and now it does not work. I tested my WiFi with others and they all get the signal and excellent connectivity.
My z2 is either stuck in step "obtaining the IP address" or telling me he avoided a bad connection, despite the fact that I have this option disabled.
I tried turning everything market, I tried forgetting the network and reconnect. I tried to unplug my swr10 smartband I read another post suggested that it caused problems.
Nothing works. It will be not just to connect to my WiFi at home.
I read a post suggesting the firmware requires a downgrade but I'm not technical interest and I'm afraid to try because it is a new phone and I don't want to void the warranty.
Someone at - it ideas?

I think that I have solved it without going through the firmware downgrade. I went to advanced, disabled wifi wifi optimization. Then he returned, and then rebooted the phone. WiFi has been the connection perfectly for this, but as I do not understand the phones I can't offer an explanation as to why! It has been working well for 3 days now. I'll keep it under control, but it is worth a try for someone else in the same situation. I also have a colleague with a z1 which must have WiFi optimization disabled permanently to run WiFi, once again, don't know why but yet once worth a try.

Tags: Sony Phones

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