Hi apfelkopf,
Thanks for coming to Apple Support Communities for help today with Music on your Mac. It sounds like you have songs that are being uploaded for a few days now.
You can read more about status icons here: Identify cloud status icons in your music library on your Mac or PC.
"If you see a dotted-line cloud next to a song, then it might mean one of the following:
- Waiting: The song is in the process of being matched and hasn't been uploaded. Choose File > Library > Update Cloud Music Library to resolve this.
- Not Uploaded: The song was added from another device and can't be matched. To upload the song, turn on Sync Library on the computer where the original audio file is stored.
- No longer available: The song is either not available in the Apple Music catalog, or hasn't been released yet."
Connecting to power or trying a different network are definitely good steps to try. You may even want to restart your computer.
Have a fantastic day!