AAA problems

[CSCO10583165]

I have a doubt. A tacacs server can finish a lot of ppp sessions of customers by don't receive accounting information?

[drolemc]

To generate accounting records, you need to enable AAA by entering the necessary commands. For more information, please see http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fsecur_c/fsaaa/scfacct.htm

[CSCO10583165]

My problem is that we have a lot of customer connected to a 7206VXR and this AAA with CISCO SECURE.

We have suffered twice drop of a lot of ppp customers and haven't seen go down link neither nothing problem in box.

Because of this my question. Cisco Secure can drop a lot of calls ppp after have already connected and passed AAA?

Thank in advance.