I'm experiencing annoying problem with the notification area (which shows Volume, BlueTooth, WiFi and Power status) .
After booting my notebook the power icon is not visible in the notification area, although the power management is configured to always show the power status notification.

I can (temporary) repair the notification area by removing it from the task-bar and then adding it again to the task-bar. The power icon stays visible until the next shutdown.

The situation after reboot:

The situation after reattaching the notification area:

I'm tired of reattaching the notification area each time after booting my PC.
Is there a way to fix this?

Thanks in advance!