Cant scan trend values

Cant scan trend values

Hello
We have a customer where we can get data displayed, but not scan it. It have happened a couple of times now. If I delete the archives the new data can be scanned, but after some time it cannot be scanned anymore
Any suggestions to what can be wrong?

This is a migrated post! Originally posted on 23.09.2014 by user brc. Please be aware that information can be outdated.