Over the past few days I've had my router intermittently rebooting itself for reasons I don't yet understand. On one occasion I had 3 reboots inside an hour but then it might go 3 or 4 days, or longer, without rebooting itself. I have included an extract (slightly edited) from the syslog showing a typical lead up to a reboot and would welcome suggestions as to why this might be happening...
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Nov 5 11:55:28 daemon warn radvd[9135]: received RA from fe80::6203:47ff:fe4b:xxxx
Nov 5 11:55:28 daemon info radvd[9135]: attempting to reread config file
Nov 5 11:55:28 daemon info radvd[9135]: resuming normal operation
Nov 5 11:55:28 daemon warn radvd[9135]: received RA from fe80::6203:47ff:fe4b:xxxx
Nov 5 11:55:28 daemon info radvd[9135]: attempting to reread config file
Nov 5 11:55:28 daemon info radvd[9135]: resuming normal operation
Nov 5 11:55:28 daemon warn radvd[9135]: received RA from fe80::6203:47ff:fe4b:xxxx
Nov 5 11:55:29 daemon info radvd[9135]: attempting to reread config file
Nov 5 11:55:29 daemon info radvd[9135]: resuming normal operation
Nov 5 11:55:29 daemon warn radvd[9135]: received RA from fe80::6203:47ff:fe4b:xxxx
Nov 5 11:55:29 daemon info radvd[9135]: attempting to reread config file
Nov 5 11:55:29 daemon info radvd[9135]: resuming normal operation
Nov 5 11:55:29 daemon warn radvd[9135]: received RA from fe80::6203:47ff:fe4b:xxxx
Nov 5 11:55:29 daemon info radvd[9135]: attempting to reread config file
Nov 5 11:55:29 daemon info radvd[9135]: resuming normal operation
Nov 5 11:55:29 daemon warn radvd[9135]: received RA from fe80::6203:47ff:fe4b:xxxx
Nov 5 11:55:30 kern crit kernel: eth4 (Int switch port: 3) (Logical Port: 3) Link DOWN.
Nov 5 11:55:30 daemon info radvd[9135]: attempting to reread config file
Nov 5 11:55:30 daemon info radvd[9135]: resuming normal operation
Nov 5 11:55:30 daemon warn radvd[9135]: received RA from fe80::6203:47ff:fe4b:xxxx
Nov 5 11:55:30 daemon info radvd[9135]: attempting to reread config file
Nov 5 11:55:30 daemon info radvd[9135]: resuming normal operation
Nov 5 11:55:30 daemon warn radvd[9135]: received RA from fe80::6203:47ff:fe4b:xxxx
Nov 5 11:55:31 daemon warn radvd[9135]: poll error: Interrupted system call
Nov 5 11:55:31 daemon warn radvd[9135]: Exiting, sigterm received.
Nov 5 11:55:31 daemon err dhcp6c[8982]: client6_send: transmit failed: Network is unreachable
Nov 5 11:55:32 kern warn kernel: ETH Init: Ch:1 - 200 tx BDs at 0xb0820650
Nov 5 11:55:32 kern warn kernel: ETH Init: Ch:1 - 600 rx BDs at 0xb0a21910
Nov 5 11:55:32 kern warn kernel: [FAP1] enetRxChannel 1
Nov 5 11:55:32 kern crit kernel: eth4 (Int switch port: 3) (Logical Port: 3) Link UP 100 mbps full duplex
Nov 5 11:55:35 daemon info email[17496]: eMail: SMTP_SERVER:smtp.fastmail.com SMTP_USER:xxxxxxxx@fastmail.net SMTP_PASS:xxxxx SENDER_MAIL:xxxxxxxxt@fastmail.net PORT:587 USE_TLS:true
Nov 5 11:55:35 daemon info email[17496]: eMail: Subject:WAN IP Change (new IP:192.168.2.0)
Nov 5 11:55:37 kern warn kernel: eth4.1 MAC address set to 60:03:47:4B:6C:25
Nov 5 11:55:37 kern warn kernel: netdev path : eth4.1 -> eth4
Nov 5 11:55:37 kern warn kernel: BCMVLAN : eth4 mode was set to RG
Nov 5 11:55:37 daemon notice syslog: pppd:cms logging initialized.