Windows suddenly not going idle

Since about a week or so my PC has suddenly stopped going idle. Skype never shows away, computer will not sleep.

Windows 10 version 1803.

I have checked powercfg -request and although initially the mic device was being kept open by Cortana I disabled Cortana so that is no longer the case. Regardless it was not an issue before.

I have not installed any new software in this period, although some may have auto updated.

I have looked at all the programs/services being started at boot and removed them from auto start - but the problem persists.

In a random fashion, idle does work on first boot, for a while. Sometimes it stops after the first idle period is interrupted, sometimes it works for a few hours. I have failed to find a pattern.

I am assuming there is some way to investigate exactly what is keeping Windows from going idle - but other than powercfg commands I have not found any mention of it through searching.

Any help greatly appreciated.

Jules.

Well I haven't solved it, but I know what is causing it. Edge. Even if the application is not running it starts some processes a while after boot. If those processes, or Edge itself, is running the PC wont idle. End those tasks and it is fine.

Now to find a fix.