So I'm working with SSRS (SQL Server 2005), which some of our applications use to generate downloads. The problem with it, though, is that the Reports website that is used to manage it seems to crash randomly. I haven't yet figured out a rhyme or reason to it - only that it will suddenly bust out with a 'Specified cast is not valid' exception and any further attempts to do anything will fail with 'The item '/' cannot be found (RsItemNotFound)'
Is there a place I can start looking to help me debug this issue? Are there logs that might have more in-depth information than the useless error messages I'm getting?