Seems like i found the problem why some modules stopped working.
I revisited my MM configuration and noticed i had lost my “keep WiFi active” configuration…
I opened /etc/network/interfaces and put in the missing “wireless-power off”.
More infos here: https://forum.magicmirror.builders/topic/236/complete-setup-tutorial/6 (see chapter “Installing MagicMirror - Step 4”)
MagicMirror² v2.20.0 is available! For more information about this release, check out this topic.