I have two routers connected together and one of them occasionally (every two weeks or so) locks up.
By 'locks up' I mean, I cannot ping the interface 10.10.10.3 from anywhere but if I am on the connected router 10.10.10.1 I can telnet to 10.10.10.3? Once on the router no traffic will leave the router, out any interface. All interfaces are up up, and I don't see any errors counted. The only way to solve the issue is to reset router 10.10.10.3.
There is also another router connected to 10.10.10.1 which is 10.10.10.2 and it is setup exactly the same as 10.10.10.3 and is the same router same IOS and it does not have this issue.