No sound after 17th Oct

Product: Battlefield 1
Platform:PC
Summarize your bug No sound at all
How often does the bug occur? Every time (100%)
Steps: How can we find the bug ourselves? launch the game
What happens when the bug occurs? no sound
Please select your region Asia
In what game mode did the bug occur? Single Player Campaign
In what Single Player War Story did the bug occur? Prologue
AMD or Nvidia Model Number
Enter RAM memory size in GB

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no sound after entering the game. but before the sound works, there is no sound after 17th Oct. Please help.