By default FastCGI processes exit after 500 requests. You can either raise PHP_FCGI_MAX_REQUESTS
(in the wrapper) or limit FcgidMaxRequestsPerProcess
to 500 in block.
I don't think you can resolve this without modifying FastCGI configuration, but I could be wrong though.
Read http://httpd.apache.org/mod_fcgid/mod/mod_fcgid.html#examples