I have a PIX 515 running 8.0(3) that is crashing every 20 minutes or so, this is what immediately appears on the console when it crashes:

============= CHECKHEAPS HAS DETECTED A MEMORY CORRUPTION ===============

Reason: Free buffer corrupted rc=1

I have swapped out the physical memory with new memory but the PIX keeps crashing, so I don't think it is a problem with the memory installed.

sh ver:

Cisco PIX Security Appliance Software Version 8.0(3)

Compiled on Tue 06-Nov-07 19:50 by builders

System image file is "flash:/pix803.bin"

Config file at boot was "startup-config"

hqfw01 up 8 mins 51 secs

Hardware: PIX-515, 128 MB RAM, CPU Pentium 200 MHz

Flash i28F640J5 @ 0x300, 16MB

BIOS Flash AT29C257 @ 0xfffd8000, 32KB

0: Ext: Ethernet0 : address is 0050.54ff.43d6, irq 10

1: Ext: Ethernet1 : address is 0050.54ff.43d7, irq 7

2: Ext: Ethernet2 : address is 00d0.b78f.3c33, irq 11

Licensed features for this platform:

Maximum Physical Interfaces : 6

Maximum VLANs : 25

Inside Hosts : Unlimited

Failover : Active/Active

VPN-DES : Enabled

VPN-3DES-AES : Enabled

Cut-through Proxy : Enabled

Guards : Enabled

URL Filtering : Enabled

Security Contexts : 2

GTP/GPRS : Disabled

VPN Peers : Unlimited

This platform has an Unrestricted (UR) license.

I appreciate any assistance.