My PPPoE Server is in a CCR 1036 v6.36.2.
All clients remains conected for just exactly 1 hour , then disconnect and reconnect. All clients PPP.

Somebody can help me ?

Nobody can tell you what is the problem without more details.
Upload your export configuration file, don't forget to hide/mask sensitive data.

Regards,
M.

Also use latest Bugfix Version 6.36.4