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http://talk.sonymobile.com/t5/FAQ/Wi-Fi-problems/m-p/348104#U348104
Hi,
I was wondering is your Bluetooth switched on & connected?
On my SP, the Wi-Fi 2.4Ghz network disconnects while Bluetooth is connected and vice versa.
Do you've a 5Ghz Wi-Fi network? If so, does it better work for you?