App icons in dock disappear
Hey guys,
from time to time I experience that my App icons in the dock disappear. It doesn't help to close the apps (so the whole app is no longer in the dock). The icon then also aren't in the notification centre as well. It happens to Apple as well as non-Apple apps.
Sometimes they just re-appear, but I don't know how I could influence that (except rebooting). This is kind of annoying.
Thanks for your help!
Dock:
(left one is WhatsApp, the right one is TextEdit)
Notification centre:
MacBook Pro (13-inch, Late 2016, 4 TBT3), macOS High Sierra (10.13.1)