PPPoE Clients Disconnecting on any change

HI,
I know this post has been around the traps already but in my situation i can not find a solution to this problem.
Upgraded to 6.46.8 did not solve issue. Issue is that i have a PPPoE server where if any changes to any of the bridge clients is made ie client goes down then all of the PPPoE connections are dropped and restarted. I have applied an administative MAC on the bridge interface (the recommmended solution) but its not working.
Everytime i make a change manually or a client disconnects - all clients are disconnecting and reconnecting.
Any Advice on how to track whats happening and solution please.