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Forerunner 965 WIFI auto sync fail

It has been weeks that my Forerunner 965 fails to auto sync with my Garmin Connect when I finish run and reach home, I have both WIFI and Bluetooth turn on. 

9 out of 10 times, only one time it sync automatically to Garmin Connect.

What's wrong, my WIFI network is both 2.4 and 5Ghz, do i need to choose only 2.4 Ghz WIFI network ?