Volume buttons bug

Hi.
After pressing and hold the volume buttons on the keyboard, the system logs me out to the login panel. Does anyone have similar system behavior?

I have never experienced such strange behavior.
Media keys are configured by default in Mabox like that (see ~/.config/openbox/rc.xml):

    <keybind key="XF86AudioRaiseVolume">
      <action name="Execute">
        <command>pamixer -i 2</command>
      </action>
    </keybind>
    <keybind key="XF86AudioLowerVolume">
      <action name="Execute">
        <command>pamixer -d 2</command>
      </action>
    </keybind>
    <keybind key="XF86AudioMute">
      <action name="Execute">
        <command>pamixer -t</command>
      </action>
    </keybind>
    <keybind key="XF86AudioStop">
      <action name="Execute">
        <command>playerctl stop</command>
      </action>
    </keybind>
    <keybind key="XF86AudioPlay">
      <action name="Execute">
        <command>playerctl play-pause</command>
      </action>
    </keybind>
    <keybind key="XF86AudioPrev">
      <action name="Execute">
        <command>playerctl previous</command>
      </action>
    </keybind>
    <keybind key="XF86AudioNext">
      <action name="Execute">
        <command>playerctl next</command>
      </action>
    </keybind>

Volume control shortcut is super+v, Logout dialog: super+x.

I’m using a Logitech K360 wireless keyboard which has separate buttons for volume up and down. The easiest solution will be to use the keyboard shortcuts set in the system.