My grandma got an iPhone 8 Plus last week. Updated the software to 14.3 and the phone will connect to WiFi for about half an hour and then it will not connect. The WiFi button actually greys out, totally unable to even turn it on. When I reset the general settings the issue is fixed temporarily for about half an hour before the WiFi connection breaks again. Not an issue with the WiFi, it works fine on my 6S. Had support from Apple chat, apparently a hardware issue and send the phone in? I doubt it since everybody else has the same issue.
Roseeb93
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