Why doesn't my notification bar show up all of the time?

[izik79]

Notification bar problem

Hello and excuse my poor English in advanced

My LG G3 device (Android 5.0, ver. V20h-ISR) has a strange bug: sometime the notification bar doesn't show up
meaning, I see some icon on the status bar, but when I slide bar down - I don't see the notifications (the white part) - at all
Only thing that solves it is restarting the device, and problem comes back after 2-3 days, about.

Is there any solution for this annoying bug?

Thank you so much

Izik