Thank you for the update Riardon,

I have a few additional questions regarding your issue:

1) Does the audio drop only when you use ALT+TAB? Or does it happen at random?
2) Are these crashes caused by the same thing? Only when using ALT+TAB? Do you notice any pattern to them otherwise?
3) What kind of audio device are you using? Are you using speakers through a 3.5mm jack? Or perhaps a USB device?
4) In the bottom right corner of your desktop, you will find the system tray. Click on the volume control and select Playback Devices. How many options do you have and have you tried switching between any of them?
5) Do you have any other sound devices on your PC (i.e. microphones, headphones, etc.)?
6) Have you installed any programs that may utilize the sound drivers such as sound mixing or recording software?

I understand this is a frustrating issue. We are having trouble replicating the issue on our side so if you can give a step by step description of what leads to the error, we may be able to better find a resolution.

We hope we can be of assistance in helping you enjoy the exciting world of Final Fantasy XIV!