Recently I have upgraded my 4011 from 6.49.8 to software and firmware 7.11.2
On two of my 13 routers there was an unexpected behavior, after several ( one over 10, other over 14 ) days of work. Ethernet ports 1-5 went suddenly down.
In logs I only get :
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Nov 27 22:45:34 10.0.77.138 interface,info ether1 link down
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Nov 28 06:07:39 10.0.77.138 dhcp,warning dhcp-ap_mgmt offering lease 172.16.152.78 for FC:EC:DA:89:AD:99 without success
Nov 28 06:07:43 10.0.77.138 dhcp,warning dhcp-ap_mgmt offering lease 172.16.152.86 for FC:EC:DA:89:DA:86 without success
Nov 28 06:07:44 10.0.77.138 dhcp,warning dhcp-ap_mgmt offering lease 172.16.152.94 for FC:EC:DA:89:91:28 without success
Did you perhaps encounter similar behavior?