Question : Inconsistent crystal reports

I have a report that has a few subreports.
When I run the report, sometimes the data appears and sometimes the data does not.
The data is in the database, it's just not showing up on the form for some reason.

Am I doing something wrong or not doing something?

Thanks.

Answer : Inconsistent crystal reports

Could you provide the complete query.....?
So we can look at it and maybe get a better clue of why this happens some times...?