PPPoE KeepAlive Timeout ?

I use CCR1009. I use both hotspot and PPPoE.
Recently started using PPPoE, have 11 customers on PPPoE now.

I see, when the customers are not doing anything, then the log shows, disconnecting connecting in every 1 minute for this inactive customers.

I read someone its related to keep alive timeout in PPPoE server profile.

Is it true ?


See the below two screenshots for reference and let me know, whats the solution ?