Action sound recording problem

[Molda22]

Hi
all my specs are listed below and my problem is this: I've been using the combo of Action for recording video and audacity for recording audio for long time without any problems on windows 7. But i have switched to Windows 10 and now there is a very big problem for me.
When i record audio from my mic in audacity when Action is off, everything is ok, but as soon as i start recording the video (gameplay) with action, the audacity recording suddenly becomes very very low volume and bad quality. when i stop recording video in action it suddenly becomes fine again.
So it cannot be audacity problem, it has to be something with Action, but i dont know what could be doing this.
It is very important to me and i hope someone will be able to help me with this. Thanks a lot.
(it also cannot be game problem, i tested it with different games, even just with desktop recording, same problem, as soon as i hit the button for record video in action, it ruins the audio recording. )

WIN 10 64b
NVIDA GTX 970
16 GB RAM
Intel Xeon
gigabyte h97 motherboard
up to date Mirillis action
up to date Audacity