ZODB.Conflict errors when having lots of documents in a folder

Dear Silva developers,

I get a lot of ZODB.Conflict errors in the Zope "event.log" file when I 
have a lot of Silva documents (~ 500) in a Silva folder.

My Setup:
  + Python 2.3.5
  + Zope 2.8.7
  + Silva 1.5.6

Example:
In the SMI I click on the contents tab to get the list of all Silva 
documents inside a Silva folder. From time to time I get "ZODB.Conflict" 
errors in Zope's "event.log".

Examples:

------
2006-08-02T14:38:11 INFO ZODB.Conflict database conflict error (oid 
0x09, class Products.Transience.Transience.Increaser, serial this txn 
started with 0x03673a34d462abcc 2006-08-02 12:36:49.777836, serial 
currently committed 0x03673a360db464ee 2006-08-02 12:38:03.212031) at 
/silva156/A/edit (1 conflicts, of which 0 were unresolved, since startup 
at Wed Aug  2 13:58:17 2006)
------
2006-08-02T14:54:52 INFO ZODB.Conflict database conflict error (oid 
0x62, class BTrees._OOBTree.OOBTree, serial this txn started with 
0x03673a4523fa8133 2006-08-02 12:53:08.432469, serial currently 
committed 0x03673a46c6503a22 2006-08-02 12:54:46.479700) at 
/silva156/A/edit/tab_edit (2 conflicts, of which 0 were unresolved, 
since startup at Wed Aug  2 13:58:17 2006)

On a Silva site with a lot of authors I get a lot more "ZODB.Conflict" 
errors.

Any idea, what's going wrong there?


Regards,
Nico