asterisk users - Jul 2005 - beronet and tdm400p cards conflict?

Hi,
I'm currently using a beronet quadBRI and a Digium tdm400P card on a 
Poweredge SC420 DELL with mandriva 2005 LE (standard installation) but 
this particular configuration gives me a problem: sometime the 2 cards 
work well toghether, sometimes it is impossible to make/receive calls.
Is there anybody out there who is currently using this configuration 
without problems?

TIA

Giorgio