Not all files could be synched

Hello,

I get the error message that not all files could be synched. Two files are given and I deleted them. Also from the trash.

But the error messages doesn't disappear even after weeks. Stop sync, reactivate sync. Logged out from the account, logged in with a different one and logged back into the first account. The messages still appears.

The second user using the same ID doesn't have this error. No one with another account has the error. The files definitely don't exists anymore.

Is there a way to fix this?

Also: the Cloud seems to be very slow at the moment. I have a fast internet connection (50 MBIT), but 2gb data is still synching after days...

Thank you!