I had to download 5.8.6.3 manually and install to stabilise my system, give that a go?

Ah good. I just got 5.8.2.2 and installed it, back to operation.

I am glad the BI team iterate so quickly. Thank you also for your suggestions.

!solved

'The video stream was lost.
Attempting to reconnect...'

As far as I know, beside Windows 10 updates, no other variables have changed since it last worked well.
Is there a trouble shooting path you could point me at to work out what I need to do to get back on track?

My Hikvision camera has a built-in microphone. When accessing the camera directly, I can hear the microphone.
I am not able to configure Blue Iris to hear the microphone.

Are there any troubleshooting resources I can apply?