Bananian some syslog are not saved

AR9285

I use tail -f /var/log/syslog to monitor the log. Yesterday I noticed some random ethernet disconnection, and I found the disconnection event was indeed logged. But just now I found out that the syslog file was reset, and I cannot fing the log entry regards to disconnection anywhere in /var/log/syslog, syslog.1, syslog.2.gz, ....

I used " grep -Ri 'Link is Down' /var/log/ " and nothing useful returned. But I saw that log entry did appear in tail -f /var/log/syslog.

It should look like this but I cant find it anywhere in logs of Oct.3

1. 
   
2. Oct  4 11:54:11 debian kernel: [334637.832167] PHY: sunxi_gmac-0:00 - Link is Down
   
3. Oct  4 11:54:13 debian kernel: [334639.842081] PHY: sunxi_gmac-0:00 - Link is Up - 100/Full

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Also the syslog in bananian seem to be logging far less info than my other debian machines. Why is that?

Thanks!