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You should try with another WiFi router at a different place. If you experience the same issue, that can mean a hardware issue. It's rare but sometimes happens: The WiFi antenna is connected to the mainboard with two pins. If one of them doesn't have a proper connection, you might be able to measure a good signal strength but with unstable data connection. If that's the case, the phone should be disassembled to adjust the position of that pin. |
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