Custom shortcuts not working Wily Werewolf (Unity/Kubuntu)

[gorilych]

I have custom hotkeys (like CapsLock for changing keyboard layouts) and after some time they stop to work. Nothing happens when I use keyboard shortcut. It starts working again for sometime if I go to the settings and reconfigure it.

$ lsb_release -rd
Description: Ubuntu 15.10
Release: 15.10

This is Kubuntu (fresh installation)

Let me know what additional information I can provide. Unfortunately I don't know which package is responsible for keyboard shortcuts in Kubuntu.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Dima Rostopira (rostopiradv)]

Reassign of default shortcuts works fine
But custom just don't work in both unity and kde (fresh installs of Ubuntu and Kubuntu Wily)

[Dima Rostopira (rostopiradv)]

It's not mixed environment
I installed clean Ubuntu with unity and tested
Then installed clean Kubuntu with kde and tested
Not working in both

[Flames_in_Paradise (ellisistfroh-deactivatedaccount)]

@ rostopiradev: Tks for clarification, changed title accordingly.–