I'm using Bandicam 18.104.22.1684 on my Windows 10 PC.
The issue I'm facing is while recording screen if I change default audio then Bandicam stops recording audio until the device is switched back to the previous one.
To regenerate this issue follow the below steps:
1) Set Primary Sound Device to (Default Sound Device) and secondary to Disable in Bandicam settings.
2) Start recording the screen and play some YouTube video.
3) Open Windows 10 Sound settings (Right click the sound icon in system tray and click on Sounds)
4) Change the default sound to Bluetooth Headset or another audio device. Now Bandicam stops recording audio until you switch back to the previous default sound device.