[Zope-DB] Getting 500's and 503's from Zope + Firebird

[Tomas Holenda]

Hi,
I have combination Apache, pcgi, Zope 2.5, gvibDA 0.9.7., Firebird 1.0.0 RC2
On pages using database, I often get 500 Internal Server Error and 50 
Service Unavailable.
I tested it with torture.pl and the results vary. Sometimes it's 100%OK, 
sometimes 75% errors.

Pages without database use are allways OK.

Do you have any idea, where can be the problem?

Thanks
    Tomas.