Can't update forward map no such RRse

[raztaboule]

Hello ,
( and sorry for my poor english )

I'm using DHCP Server V3.0.1rc13 and BIND 9.2.4rc4.
My DHCP servers ( i've got two dhcpd ) update Bind .
but some time Bind just say

Can't update forward map <hostname> to <@IP> no such RRset

and reverse zone is not updated, so my dhcp clients are known whith their old @IP in the reverse zone .

Any ideas ?

Thanks.