Problem with Alcatel ISAM and CPEs

Hi
We are using Alcatel ISAM 7302 Series for providing ADSL service. The solution which is used is based on PPPoE. So we have a BRAS and several DSLAMs are connected to it via several links to the BRAS.
The case is this:
1) CPEs are connected to DSLAM and they established PPPoE session to BRAS.
2) The link between DSLAM and BRAS fails or BRAS fails itself.
3) After Link/BRAS recovery some users cannot be connected to the BRAS.
4) DSL ports are configured in Bridge mode and they are placed inside an identical VLAN.
5) With some users we need to turn off/on the CPE.
6) With some users we need to delete ATM/Bridge configuration on the port and do the configuration again.

We are using several types of CPE.
Is there anybody encountered this type of problem with Alcatel ISAM 7302?

Thank you
Ali