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Wifi connects but signal fades. disconnect and reconnect solves momentarily. This is very common. Read all the other posts. Reset entire phone to no avail. This is just a note for potential owners. I've spent hours trying to repair this and the frustration is taking it's toll.
You don't have to convince me or anyone, if you believe there's an issue with your phone that PCC has not solved then contact your local Xperia Care, keep in mind that each case its different.