Cisco ASA 5505 Site-tp-Site VPN stops passing traffic

Hi there,
Have two Cisco 5505's - both running version 8.2(1). We have a site to site VPN between them and it works fine. However, the traffic stops passing over the tunnel. The tunnels stay up, but no traffic is passing. I have made sure that the following has been set:
crypto ipsec security-association lifetime seconds 86400
crypto ipsec security-association lifetime kilobytes 2147483647

The lifetime keys runs out before the above data limit is hit as not a huge amount of data passes over the VPN Tunnel
Yesterday for example, I established the tunnels at 8:30am in the morning. By using ping plotter, I could see that the tunnel had dropped at around 5:15am this morning for some reason. This was shown also with the IPsec  Session details showing that 12000 secs of the Rekey Left had passed  (checked at around 8:30 today, so 12000secs equals roughly 3 1/4 hours)
Not traffic was passing over the tunnel. Under VPN statistics, it was still showing that the tunnel had been up for about 23 odd hours.
I don't want to upgrade to 8.4, as one of the ASAs has a huge config.

Any thoughts on this?
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MattConnect With a Mentor Commented:
Do you have this in your config?

tunnel-group DefaultRAGroup ipsec-attributes
 isakmp keepalive threshold 10 retry 2
Any pattern when traffic stops? Is this actually affecting production traffic?
greentriangleAuthor Commented:
No pattern for when it stops. Internet traffic is still passing. It is causing issues a bit, due to replicationbetween sites (ie DNS, and some SQl backups - minimal in size however)
I have this on HQ ASA 5510:

crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000

And IPSEC VPN Site-2-Site Works OK with remote offices, using ASA 5505.

But try to upgrade to ASA 8.2(5) - the latest interim release is 8.2.5-(55). There is no change in config - still "old" NAT :)
greentriangleAuthor Commented:

I have upgraded both devices to 8.2 (5)33 but the issue still exists. Traffic stops passing. Thoughts?
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