Call hangup after 3-4 seconds on zap device

I’have asterisk installed on fc8 with zap drivers
I’have an E1 on the te121 card with many numbers.
some calls on the E1 are ok and some other are bad.
in the /var/log/asterisk/full I have plenty of:

channel.c: Avoiding initial deadlock for channel ‘0x9277298’

the calls on sip are all ok (even on the same application)
I can make outgoing call with this card

Is someone have any suggestions , tests or other.

thanks a lot
– sebastien