The only reason that the it would re-index the drive like this, is if the ChunkID database was not properly maintained. It will also happen on drives that haven't been mounted since the Chunk ID database code was added.
If you're seeing this a lot, then please do let me know.
As for the detach error, could you install this version?
I ran into this. Downloaded from that link. I'm hoping it is a false positive, but Avira informs me that CloudDrive.UI.exe contains the pattern of TR/Dropper.MSIL.Gen2
Stablebit Clouddrive is connecting to the provider and finding your data
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I ran into this. Downloaded from that link. I'm hoping it is a false positive, but Avira informs me that CloudDrive.UI.exe contains the pattern of TR/Dropper.MSIL.Gen2