Hey kunqi, When connecting wifi on your phone, make sure the devices are within 10-15 meters to each other. Then check for Bixby routines and deactivate it as mentioned by Ray2. Please disable the Power saving mode on your phone. Power saving mode helps extend the battery life of your Mobile device by disabling features and limiting the CPU usage of your device. You can adjust the Power Saving Mode from Optimised, Medium and Maximum Power Saving. Go to Settings > Device Care > Select Battery > Tap on Power mode > Choose your preferred Power Mode.
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