first of all i love this product

But actually we have an issue with One Drive Backup.
Sometimes we get an error: Backup proxy offline time exceeded.

One of the users has about 80GB in his One Drive.
Sometimes it take 2 minutes for the backup and sometimes 2 hours, even if not much changes are made.
And between we got the errors seen in the picture.
Onsite we have a 100Mbit Connection so i don't think it should be a bandwidth issue.
Perhaps some hints where we can start to troubleshoot?
BR
Benny