I have exactly the same issue. My Z5 is still receiving the WiFi signal perfect and my XZ1 simply can't be used via WiFi. If I want to search something on Google over speach I have to use my mobile network. Games are freezing every few seconds and wait untill the connection works again for a few seconds. Downloads are slowing down extremely and need hours. When I restart the phone it works sometimes. But only for a short while. Does Sony answer here overall?
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