I don’t experience the problems you have Neutron and I’ve also got sleep deactivated on my system.
On my setup, screensaver starts after 45 minutes and monitor off never. In advanced settings I notice that my hard drive is set to power off after 20 minutes.
I only find AxCrypt signs me out after the screensaver starts therefore I can leave my computer inactive for 44 minutes and AxCrypt is still signed in.
Maybe something has changed in the Creators Update because I’m using the stable version of Windows: 1607 (14393.1358). I am running the latest version of AxCrypt 2.1.1509.
- increasing the monitor off time or better still disable it and see if the problem reproduces
- increasing your hard drive turn off time
- checking ‘allow hybrid sleep’ and also ‘hibernate’ in Advanced Settings
Maybe Svante has some more input?