I have a problem with my external Mic audio level. When I first open OBS the level is OK and then over a period of about 30 seconds it winds itself down. Probably about 50dB so then I have to go to the PC mic level and turn everything up to max and also +26 bD in OBS to get any audio on my livestream. Even then the livestream audio is very low. Incredibly frustrating and I've tried heaps of different setting adjustments. Can anyone help please.