console -A and console down

I have a console that suddenly decided to go into the down state.  The 
log the for console looks like this:

[Mon Nov 24 11:30:00 2003]         Mon Nov 24 11:30:00 EST 2003
[Mon Nov 24 11:30:00 2003]^M
[Mon Nov 24 11:45:00 2003]         Mon Nov 24 11:45:00 EST 2003
[Mon Nov 24 11:45:00 2003]^M
         Mon Nov 24 12:00:01 EST 2003
[Mon Nov 24 12:00:01 2003]^M
[-- Console down -- Mon Nov 24 12:11:00 2003]
[-- Console up -- Mon Nov 24 12:11:22 2003]

[Mon Nov 24 12:11:23 2003]Password OK
[-- Console down -- Mon Nov 24 12:12:18 2003]
[-- Console up -- Mon Nov 24 12:12:30 2003]

[Mon Nov 24 12:12:30 2003]Password OK
[-- Console down -- Mon Nov 24 12:14:04 2003]
[-- Console up -- Mon Nov 24 12:14:13 2003]

[Mon Nov 24 12:14:14 2003]Password OK
[Mon Nov 24 12:15:00 2003]         Mon Nov 24 12:15:00 EST 2003
[Mon Nov 24 12:15:00 2003]^M
[-- Console down -- Mon Nov 24 12:25:44 2003]
[-- Console up -- Mon Nov 24 12:25:44 2003]

[Mon Nov 24 12:25:45 2003]Password OK
[-- Console down -- Mon Nov 24 14:25:44 2003]
[-- Console up -- Mon Nov 24 14:25:45 2003]
[-- Console down -- Mon Nov 24 14:25:45 2003]
[-- Console up -- Mon Nov 24 14:37:16 2003]
[-- Console down -- Mon Nov 24 14:37:17 2003]


Each machine prints the time to the console every 15 minutes to confirm 
that the console is working.  We are using Cisco 3620 terminal servers.  
Any idea why the console would suddenly go down like that?

When I try to connect to the console:

$ console -A foo
[Enter `^Ec?' for help]
[line to console is down]
[replay]
[no log file on this console]

But there is a log file for this console.  /var/log/consoles/foo exists 
and has data in it.

The conserver.cf entry looks like this:

console foo {
        host bar;
        port 2020;
        logfile /var/log/consoles/&;
        master localhost;
        type host;
        timestamp 1la;
}