Dell Inspiron i7359-8404SLV has sound issue

The laptop is totally new. It's delivered 2 days ago. Everything is fine until I find the sound issue.

The sound is working as I turn on the laptop, but if I restart the laptop, the sound is gone.
And if I shut down the laptop completely, then turn on the laptop again, the sound is working again.

Sound device is Conexant SmartAudio HD CX20722, OS: WIN10 home 64-bit

I have tried re-installation of the audio drivers which is download from the Dell website, reinstall WIN 10, and all other kinds of suggestions. But sadly they are all failed.

I am really appreciated anyone can help me with that. Thanks so much.


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