从淘宝上买的MT7620A的开发板，编译openwrt生成极1S HC5661的固件(也试过其他mt7620a的固件，现象一样)。刷进去后一切正常，只是用一段时间之后就再也上不去网了(无线/有线都不行)。路由后台luci可以进，网络诊断里ping openwrt.org显示失败。需要重启一下，恢复正常，但一段时间后又是同样的现象。能够稳定使用的时间大概在1小时，不知道是因为什么原因导致的呢？
内核、后台信息在出现此问题之后补上，，

系统
Wed Dec 5 14:19:36 2018 daemon.warn dnsmasq-dhcp[1538]: not giving name OpenWrt.lan to the DHCP lease of 192.168.1.105 because the name exists in /tmp/hosts/dhcp.cfg01411c with address 192.168.1.1
Wed Dec 5 14:19:36 2018 daemon.warn dnsmasq-dhcp[1538]: not giving name OpenWrt to the DHCP lease of 192.168.1.105 because the name exists in /tmp/hosts/dhcp.cfg01411c with address 192.168.1.1
Wed Dec 5 14:19:36 2018 daemon.notice netifd: wan (1067): udhcpc: lease of 192.168.1.105 obtained, lease time 43200
Wed Dec 5 14:19:36 2018 daemon.info dnsmasq[1538]: reading /tmp/resolv.conf.auto
Wed Dec 5 14:19:36 2018 daemon.info dnsmasq[1538]: using local addresses only for domain test
Wed Dec 5 14:19:36 2018 daemon.info dnsmasq[1538]: using local addresses only for domain onion
Wed Dec 5 14:19:36 2018 daemon.info dnsmasq[1538]: using local addresses only for domain localhost
Wed Dec 5 14:19:36 2018 daemon.info dnsmasq[1538]: using local addresses only for domain local
Wed Dec 5 14:19:36 2018 daemon.info dnsmasq[1538]: using local addresses only for domain invalid
Wed Dec 5 14:19:36 2018 daemon.info dnsmasq[1538]: using local addresses only for domain bind
Wed Dec 5 14:19:36 2018 daemon.info dnsmasq[1538]: using local addresses only for domain lan
Wed Dec 5 14:19:36 2018 daemon.warn dnsmasq[1538]: ignoring nameserver 192.168.1.1 - local interface
Wed Dec 5 14:19:36 2018 user.notice firewall: Reloading firewall due to ifupdate of wan (eth0.2)
Wed Dec 5 14:19:39 2018 user.info adblock-3.5.5-2[1719]: adblock is currently disabled, please set adb_enabled to '1' to use this service
Wed Dec 5 14:26:52 2018 daemon.err uhttpd[907]: luci: accepted login on /admin/status/overview for root from 192.168.1.101
没网了
重新插拔LAN
Wed Dec 5 14:32:52 2018 kern.info kernel: [ 539.930838] mtk_soc_eth 10100000.ethernet eth0: port 2 link down
Wed Dec 5 14:33:02 2018 kern.info kernel: [ 540.957928] mtk_soc_eth 10100000.ethernet eth0: port 1 link up (100M
bp
s/Full duplex)
Wed Dec 5 14:33:04 2018 daemon.warn odhcpd[827]: DHCPV6 CONFIRM IA_NA from 000478be1f0afefb288da6c4e66959b1a90c on br-lan: not on-link
Wed Dec 5 14:33:04 2018 daemon.info dnsmasq[1538]: read /etc/hosts - 4 addresses
Wed Dec 5 14:33:04 2018 daemon.info dnsmasq[1538]: read /tmp/hosts/odhcpd - 0 addresses
Wed Dec 5 14:33:04 2018 daemon.info dnsmasq[1538]: read /tmp/hosts/dhcp.cfg01411c - 2 addresses
Wed Dec 5 14:33:04 2018 daemon.info dnsmasq-dhcp[1538]: read /etc/ethers - 0 addresses
Wed Dec 5 14:33:04 2018 daemon.warn dnsmasq-dhcp[1538]: not giving name OpenWrt.lan to the DHCP lease of 192.168.1.105 because the name exists in /tmp/hosts/dhcp.cfg01411c with address 192.168.1.1
Wed Dec 5 14:33:04 2018 daemon.warn dnsmasq-dhcp[1538]: not giving name OpenWrt to the DHCP lease of 192.168.1.105 because the name exists in /tmp/hosts/dhcp.cfg01411c with address 192.168.1.1
Wed Dec 5 14:33:05 2018 daemon.warn odhcpd[827]: DHCPV6 SOLICIT IA_NA from 000478be1f0afefb288da6c4e66959b1a90c on br-lan: ok fdc7:bda5:8c3e::ad0/128
Wed Dec 5 14:33:06 2018 daemon.warn odhcpd[827]: DHCPV6 REQUEST IA_NA from 000478be1f0afefb288da6c4e66959b1a90c on br-lan: ok fdc7:bda5:8c3e::ad0/128
内核
[ 22.673410] 8021q: adding VLAN 0 to HW filter on device eth0
[ 22.753092] br-lan: port 1(eth0.1) entered blocking state
[ 22.763932] br-lan: port 1(eth0.1) entered disabled state
[ 22.775091] device eth0.1 entered promiscuous mode
[ 22.784685] device eth0 entered promiscuous mode
[ 22.960853] br-lan: port 1(eth0.1) entered blocking state
[ 22.971678] br-lan: port 1(eth0.1) entered forwarding state
[ 43.979363] random: crng init done