[squid-users] squid crashing

The squid web cache proxy is crashing. The symptom is that the all client
browsers just time out after several minutes. This server was working fine
until last week. And I can't think of anything that changed last week. Since
moving into production, this is the first problem I've had with this server.
I'm eager for advice on troubleshooting. Examining the
/var/log/squid/access.log cache.log and store.log isn't showing me anything
obvious.

current squid.conf....
http_port 3128
# acl QUERY urlpath_regex cgi-bin \? #Removed by Amos, suggested to speed up
web sites using media
cache_mem 512 MB # May need to set lower if I run low on RAM
maximum_object_size_in_memory 4096 KB #Increased by Amos, suggested to speed
up web sites using media
maximum_object_size 1 GB
cache_dir aufs /cache 500000 256 256
redirect_rewrites_host_header off
cach_effective_user proxy
cache_replacement_policy lru
acl all src all
acl localnet src 10.60.0.0/255.255.0.0
acl localhost src 127.0.0.1
acl to_localhost dst 127.0.0.0/8 0.0.0.0/8
acl Safe_ports port 80 81 443 210 119 70 21 1025-65535
acl SSL_Ports port 443
acl internalSite1 dstdomain eaplus.altonschools.org
acl internalSite2 dstdomain reports.altonschools.org
acl CONNECT method CONNECT
http_access deny !Safe_ports
http_access deny CONNECT !SSL_Ports
http_access allow reports_Printing
http_access allow internalSite1
http_access allow internalSite2
http_access allow localnet
http_access allow localhost
http_access deny all
icp_port 0
refresh_pattern \.jpg$ 3600 50% 60
refresh_pattern \.gif$ 3600 50% 60
refresh_pattern \.css$ 3600 50% 60
refresh_pattern \.js$ 3600 50% 60
refresh_pattern \.html$ 300 50% 10
refresh_pattern ^ftp: 1440 20% 10080
refresh_pattern ^gopher: 1440 0% 1440
refresh_pattern -i (/cgi-bin/|\?) 0 0% 0
refresh_pattern . 0 20% 4320
access_log /var/log/squid/access.log squid
visible_hostname AMSPX01

I've had with this server. I'm eager for advice on troubleshooting.

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