@Gary
It's set to: 'Default - Headset Mic (USB Audio Device)'
Haven't done the Speech retraining yet, as I think it's something else.. But I may get there eventually..
Last night about 8pm I thought it might have something to do with me putting the earphones back on my G2 about 3-4 days ago to see if that would fix another problem**. So, I opened my WMR portal for the first time in 3-4 days, and then closed it. I also Cleared the VA log window, and went to watch a movie two hours. As I went to bed I checked this and there were No more switching mic messages. None. So I Shutdown and went to bed.
Today I booted up and started VA, and it did it again once. So I decided to close VA, and made sure it was closed from the SysTray. A minute later it happened again..
So, now I'm wondering if it's not VA? And have something to do with my interaction with windows(since it stopped doing it last night when I left the pc for the movie.) Maybe some background WMR thing??? Or Cortana?? That got turned back on also a few days ago, and I cannot stop it from loading when I boot. It's turned off in the Startup list.
** Problem: WMR not seeing my headset, and having to unplug/plug it back in all the time. I always used my speakers for VR audio all the time, so I also changed the Windows Settings/Headset/Audio and speech/ settings
'When Mixed Reality Portal is running, switch to headset audio' : Normally I have this Off, but I turned it On to test the earphones. The next day I turned this back off and it has been Off since.
'When Mixed Reality Portal is running, switch to headset mic' : This has and is always turned on.
EDIT:
PS, I also watch the 'Sound window's' Recording Tab to see the mic's switching. Every thime this happens one of the devices gets disabled and 5 seconds re-enabled. And I also just noticed that the mic input to VM Potato turns red(un-recognized) for the ones that were disabled/re-enabled. If I just select it again, it turn white(Ok).