[Zope] 'System resources exceeded' error with ZODBCDA and Access

Hi all! I have Zope 2.3.2 installed on a Windows 2000 Server. I have an Access databases and I make queries on it using ZODBCDA. It works fine, but after some time running it gives an error which in English would be (more or less) 'Microsoft ODBC Error. System resources exceeded'. The only way to get it running again is restarting Zope? The database is not very big (about 8000 records). Is it a problem of ZODBCDA, or is it Microsoft's Access ODBC driver's? Do I have to change some parameter (cache, etc.) in any of them? Any help would be appreciated. Thanks in advance, Igor Leturia