Hi francescarlsson
I am trying to help you, but if you mark my replies as unhelpful, it makes it even more difficult to do so. Others will also be less willing to help you with your problem too.
Here are some other suggestions from Netflix support you can try:
Play another TV show or movie
Try to play another TV show or movie. If another title plays without issue, go to the Viewing Activity page (https://netflix.com/WiViewingActivity) and select the Report a Problem link next to the title that did not work.
If you do not see the Report a Problem link, the problem has automatically been reported.
Is your volume on and turned up?
Make sure the volume is turned up on both the Netflix.com player and your computer.
Click Play to begin watching a TV show or movie through Netflix.com.
While your video is playing, locate the audio icon in the player control bar. Hover over the icon until you get a slider pop-up, then slide the control knob to the top to turn the volume all the way up.
If you're watching on a browser, ensure your tab isn't muted by looking for the mute icon on the Netflix tab while your video is playing. If your tab is muted, right-click on it and select Unmute Tab or Unmute Site.
Ensure the volume on your computer is also turned up.
There may be volume controls on your keyboard as part of the function keys. Depending on your setup, you may need to hold down the Function (fn) key while also pressing F1.
If you're using a laptop or tablet, unplug any external speakers or headphones to see if you get better sound through the built-in speakers.
If you need any help with your computer’s volume, check your owner's manual or talk with your computer manufacturer.
Close other browser tabs, applications or programs
Netflix streaming performance may improve if you close browser tabs, applications and programs that may be taking up your computer's memory and processing resources.
Change your audio settings (Windows App Only)
Launch the Netflix app.
Select a TV show or movie.
While your TV show or movie is playing, move your mouse over the screen.
Click the Dialog icon .
If surround sound (5.1) is selected, try changing it to a non-5.1 option.
Try Netflix again.