ppp connection goes down - requires reboot

[David Banning]

Lately I have a problem where the ppp connection goes down. 
Watching the log I see the following;

Jul 12 09:54:58 3s1 ppp[30841]: tun0: Phase: deflink: Connected!
Jul 12 09:54:58 3s1 ppp[30841]: tun0: Phase: deflink: opening -> dial
Jul 12 09:54:58 3s1 ppp[30841]: tun0: Phase: deflink: dial -> carrier
Jul 12 09:55:12 3s1 ppp[31114]: Phase: Using interface: tun0
Jul 12 09:55:12 3s1 ppp[31114]: Phase: deflink: Created in closed state
Jul 12 09:55:12 3s1 ppp[31114]: tun0: Command: default: disable ipv6cp
Jul 12 09:55:12 3s1 ppp[31114]: tun0: Command: default: set dial
Jul 12 09:55:12 3s1 ppp[31114]: tun0: Command: default: set login
Jul 12 09:55:12 3s1 ppp[31114]: tun0: Command: default: set ifaddr 209.161.205.12 206.221.248.4
Jul 12 09:55:12 3s1 ppp[31114]: tun0: Command: default: set ifaddr 10.0.0.1/0 10.0.0.2/0
Jul 12 09:55:12 3s1 ppp[31114]: tun0: Command: default: add default HISADDR
Jul 12 09:55:12 3s1 ppp[31114]: tun0: Command: default: nat enable yes
Jul 12 09:55:12 3s1 ppp[31114]: tun0: Command: default: set device PPPoE:fxp0
Jul 12 09:55:12 3s1 ppp[31114]: tun0: Command: default: set mru 1492
Jul 12 09:55:12 3s1 ppp[31114]: tun0: Command: default: set mtu 1492
Jul 12 09:55:12 3s1 ppp[31114]: tun0: Command: default: set authname [login was here]
Jul 12 09:55:12 3s1 ppp[31114]: tun0: Command: default: set authkey ********
Jul 12 09:55:12 3s1 ppp[31114]: tun0: Command: default: set log Phase tun command
Jul 12 09:55:12 3s1 ppp[31114]: tun0: Command: default: disable ipv6cp
Jul 12 09:55:12 3s1 ppp[31114]: tun0: Command: default: set dial
Jul 12 09:55:12 3s1 ppp[31114]: tun0: Command: default: set login
Jul 12 09:55:12 3s1 ppp[31114]: tun0: Command: default: set ifaddr 209.161.205.12 206.221.248.4
Jul 12 09:55:12 3s1 ppp[31114]: tun0: Command: default: set ifaddr 10.0.0.1/0 10.0.0.2/0
Jul 12 09:55:12 3s1 ppp[31114]: tun0: Command: default: add default HISADDR
Jul 12 09:55:12 3s1 ppp[31114]: tun0: Command: default: nat enable yes
Jul 12 09:55:12 3s1 ppp[31115]: tun0: Phase: PPP Started (ddial mode).
Jul 12 09:55:12 3s1 ppp[31115]: tun0: Phase: bundle: Establish
Jul 12 09:55:12 3s1 ppp[31115]: tun0: Phase: deflink: closed -> opening
Jul 12 09:55:13 3s1 ppp[31115]: tun0: Phase: deflink: Connected!
Jul 12 09:55:13 3s1 ppp[31115]: tun0: Phase: deflink: opening -> dial
Jul 12 09:55:13 3s1 ppp[31115]: tun0: Phase: deflink: dial -> carrier
Jul 12 09:55:18 3s1 ppp[31115]: tun0: Phase: deflink: Disconnected!
Jul 12 09:55:18 3s1 ppp[31115]: tun0: Phase: deflink: carrier -> hangup
Jul 12 09:55:18 3s1 ppp[31115]: tun0: Phase: deflink: Connect time: 5 secs: 0 octets in, 0 octets out
Jul 12 09:55:18 3s1 ppp[31115]: tun0: Phase: deflink: 0 packets in, 0 packets out
Jul 12 09:55:18 3s1 ppp[31115]: tun0: Phase:  total 0 bytes/sec, peak 0 bytes/sec on Thu Jul 12 09:55:13 2012
Jul 12 09:55:18 3s1 ppp[31115]: tun0: Phase: deflink: hangup -> opening
Jul 12 09:55:18 3s1 ppp[31115]: tun0: Phase: deflink: Enter pause (30) for redialing.

I shutdown ppp and restart it with no luck.  I shutoff modem and 
reboot it and wait for connection light to go solid - still no go. 

I called ISP and they say there is no problem.
I try to login to the ISP with a windows box and am successful.

Having no luck connecting with my server, I reboot, and all is fine. 

What could it be about rebooting the server that allows connection
where otherwise it is not possible?

Any ideas where I can look for answers?

my ppp.conf follows;

default: # or name_of_service_provider
      set device PPPoE:fxp0 # replace xl1 with your ethernet device
      set mru 1492
      set mtu 1492
      set authname ***********
      set authkey ***********
      set log Phase tun command # you can add more detailed logging if you wish
      disable ipv6cp
      set dial
      set login
      set ifaddr 209.161.205.12 206.221.248.4
      set ifaddr 10.0.0.1/0 10.0.0.2/0
      add default HISADDR
      nat enable yes