new Brume2, will connect to C-Spire but will cutoff after about 15mins

Newbie question. I got a new Brume2 and it will connect to internet but after 15mins, will lose connection. LED light start blinking blue, tried 2nd time and will do the same.
Connected back to my ISP (C-Spire) using my old router and no connection issues.

Hello,

Is the ISP WAN PPPoE connection?

Please share the WAN drop syslog with us.