408.shtml error and then litespeed stalls

[pguy]

Hello,

We are seeing the following error repeatedly.

2009-04-05 06:17:55.950 [INFO] [203.212.239.28:53692-0#APVH_xxx.com] File not found [/home/xxx/public_html/408.shtml]
2009-04-05 06:23:35.266 [INFO] [203.212.239.28:42786-0#APVH_xxx.com] File not found [/home/xxx/public_html/408.shtml]
2009-04-05 06:23:50.171 [INFO] [203.212.239.28:43458-0#APVH_xxx.com] File not found [/home/xxx/public_html/408.shtml]
2009-04-05 06:25:08.028 [INFO] [203.212.239.28:52639-0#APVH_xxx.com] File not found [/home/xxx/public_html/408.shtml]
2009-04-05 06:26:52.944 [INFO] [203.212.239.28:58027-0#APVH_xxx.com] File not found [/home/xxx/public_html/408.shtm

Can't seem to figure out why - the error shows up, then LS spirals out by running too many processes and the only way then is to kill lsphp & then restart litespeed.

any leads?