BGP hold timer expired

Hey Experts

I have been seeing this issue lately on my cisco 3945's. I have tried
reading lots of docs but couldn't figure out a perfect solution for this
problem. The issue is that on my ipsec tunnel, my bgp session drops. When i
see the logs i see this message:

*******************************************************************************************

Feb 15 03:53:38 PST: %BGP-3-BGP_NO_REMOTE_READ: x.x.x.x connection timed out
- has not accepted a message from us for 180000ms (hold time), 0 messages
pending transmition.
Feb 15 03:53:38 PST: %BGP-3-NOTIFICATION: sent to neighbor x.x.x.x active
4/0 (hold time expired) 0 bytes
Feb 15 03:57:40 PST: %BGP-3-BGP_NO_REMOTE_READ: x.x.x.x connection timed out
- has not accepted a message from us for 180000ms (hold time), 0 messages
pending transmition.
Feb 15 03:57:40 PST: %BGP-3-NOTIFICATION: sent to neighbor x.x.x.x active
4/0 (hold time expired) 0 bytes
Feb 15 04:03:08 PST: %BGP-3-NOTIFICATION: sent to neighbor x.x.x.x active
4/0 (hold time expired) 0 bytes
Feb 15 04:06:18 PST: %BGP-3-NOTIFICATION: sent to neighbor x.x.x.x 4/0 (hold
time expired) 0 bytes
Feb 15 04:09:47 PST: %BGP-3-NOTIFICATION: sent to neighbor x.x.x.x 4/0 (hold
time expired) 0 bytes
Feb 15 04:17:39 PST: %BGP-3-NOTIFICATION: received from neighbor x.x.x.x
active 2/8 (no supported AFI/SAFI) 3 bytes 000000
Feb 15 04:20:56 PST: %BGP-3-BGP_NO_REMOTE_READ: x.x.x.x connection timed out
- has not accepted a message from us for 180000ms (hold time), 0 messages
pending transmition.

***********************************************************************************************

Few points :

1. I have tcp-mss set to 1400 on my ipsec tunnels on both ends.
2. I have not tweaked the bgp timers.

Appreciate all the help.

-- 
Warm Regards
Raghav
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