check the CGI script. Is it writing to
a file? It may be writing to a log file
that needs to be rotated ("it's been up
for a while")

It's not just this script. My log files are cleared out about every 3 days.

As I said before, I just started getting it one day

I'm sorry I wasn't clear.
I wasn't referring to the error logs.
I was suggesting that there may be some
other file being written to from the
CGI script/program. For instance, when it
writes a log record it might:

logfile=/tmp/mycgi$$.log

echo "`date` Some important information for you" >> $logfile


...if the mycgi log was 2GB in size then maybe
(depending on your kernel parameters) the date
command might report a "write" error to your
error log.