I have the dreaded WIFi problem with 5.02, and even problems with mobile data, where it randomly drops out, especially right after unlocking screen after sleep. It works fine, but as fast as wake it from sleep, it either uses mobile data, even if WiFi is ON, and Stamina is OFF. Wifi won't turn on always. I think you have a bug with the mechanism reading signal strength, or wake / sleep issues with WiFi. Sometimes mobile data stops working altogether. Only option is to reboot the phone. I have tried Restored the phone with PC companion, not restoring backed up stuff so it's clean (so don't try the "support" trick with "restore and come back 2 days later because we want to get you off our backs for 2 days") Re-adding WiFi access point Tried other access points with 2.5 GHz AND 5GHz (it seems to die off more rarely here, but it DOES happen). Changing channel on router. Tried all of them. Disabled A/B/G on router With mobile data I don't have much of a choice, but I did change operator, and the problem has been there with both operators and both SIM cards. I have tried just about anything, and it's incredibly annoying and expensive, since it switches to mobile data constantly, and also drains battery because it is in this state. I really liked Xperia Z1 but these problems have really been there from the start as well, but became a real issue in 5.02. This is the 2nd Xperia Z1 since I thought the first one had a hardware problem with these issues. And frankly it has probably scared me from buying anything in this product series in the future.... I mean WiFi and mobile data has been around for years. It should't be too much to ask to have a working WiFi and mobile data for more than 30 minutes.
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