PIX 535 with Ver 7.0(4) is used for multiple IPSEC VPN Tunnels. One of the Tunnel to a particular Location gives below problem: -
One of the IP Subnet (10.201.0.0) across the VPN Tunnel stops responding. Though the VPN tunnel remains up and also the other subnets across the same Tunnel to same location are reachable, only one subnet goes down. This happens randomly.
Subnet starts pinging after reloading PIX.
Attached here the Show Run of PIX with Problematic Tunnel config mark RED.