Hello. I have 2 issues with audio volume management.

    1. I am using volume keys. All seems to work, but often when volume is set to maximum, all applications have lower volume, like 60%. I click to volume icon, applications tab and set slider to 100% manually for all apps. So in general it working well, but after some time (1-2h of volume changing) it stops moving application sliders, and volume is low on 'maximum'

    2. In 'multimedia' section of system settings, I can't set notifications volume. When I drag slider, it returns back immediately. It never worked on my machine since Plasma 5.8.2. So I don't have any notifications.

Please help resolve these issues.
Plasma 5.9.4, Gentoo-hardened, kde-overlay unmasked, Linux-4.9.15 + Grsecurity (with paxctld and exceptions for most kde core).