Problem reconnect internet

Hello, I have a problem with the Flint 2 firmware version 4.6.4. The router is connected via wan to ont via PPPOE name and password. If there is a problem with the internet that disconnects, once the problem is solved the router does not connect automatically, but I am forced to restart it and the connection is re-established. Why? How can I make it connect automatically?

Next time when this happens, before restart can you help to get the log?