VPN 3030 - VPN Client 4.x - loss of internal network access after 4 hours

Ever since I upgraded the VPN code to the latest release (vpn3000-4.7.1.Rel-k9.bin) users are now losing connection to the internal network at the 4 hour mark. They stay connected to the VPN, but can only ping the external interface of the concentrator. Session timeouts are set at 48 hours.

Here is the log of the client, 13:00 is the 4 hour mark.

659 12:59:56.493 07/11/05 Sev=Info/6 IKE/0x63000054 Sent a keepailve on the IPSec SA

660 13:00:04.005 07/11/05 Sev=Info/6 IKE/0x6300003D Sending DPD request to x.x.x.x, seq# = 3874843677

661 13:00:04.005 07/11/05 Sev=Info/4 IKE/0x63000013 SENDING >>> ISAKMP OAK INFO *(HASH, NOTIFY:DPD_REQUEST) to x.x.x.x

662 13:00:04.065 07/11/05 Sev=Info/5 IKE/0x6300002F Received ISAKMP packet: peer = x.x.x.x

663 13:00:04.065 07/11/05 Sev=Info/4 IKE/0x63000014 RECEIVING > ISAKMP OAK INFO *(HASH, NOTIFY:DPD_REQUEST) to x.x.x.x

667 13:00:14.571 07/11/05 Sev=Info/5 IKE/0x6300002F Received ISAKMP packet: peer = x.x.x.x

668 13:00:14.571 07/11/05 Sev=Info/4 IKE/0x63000014 RECEIVING > ISAKMP OAK INFO *(HASH, NOTIFY:DPD_REQUEST) to x.x.x.x

672 13:00:25.097 07/11/05 Sev=Info/5 IKE/0x6300002F Received ISAKMP packet: peer = x.x.x.x

673 13:00:25.097 07/11/05 Sev=Info/4 IKE/0x63000014 RECEIVING > ISAKMP OAK INFO *(HASH, NOTIFY:DPD_REQUEST) to x.x.x.x

677 13:00:35.614 07/11/05 Sev=Info/5 IKE/0x6300002F Received ISAKMP packet: peer = x.x.x.x

678 13:00:35.614 07/11/05 Sev=Info/4 IKE/0x63000014 RECEIVING