updownchecker flooding my site

My site is up and down lately. When it’s down the site spins for a long time before producing a 500 error.
I’ve enabled the error logs and it looks like a url ‘site checker’ is flooding my site with requests.(error log below)
I called godaddy where it’s hosted. They logged in and disabled the plugins and the site seems to be back up. I’m worried about turning pluggins back on…because I won’t be able to get in and turn them off.

Any advice? Is the updownchecker real or a red herring?

[Wed Apr 23 12:43:20 2014] [2280457] [fcgid:warn] [client 198.27.120.243:4709] mod_fcgid: read data timeout in 120 seconds, referer https://updownchecker.com/e207f252-1fcb-e311-93f4-00155d368c3c
[Wed Apr 23 12:43:20 2014] [2280457] [core:error] [client 198.27.120.243:4709] End of script output before headers: index.php, referer https://updownchecker.com/e207f252-1fcb-e311-93f4-00155d368c3c
[Wed Apr 23 12:43:20 2014] [2280457] [fcgid:warn] [client 95.128.56.36:52325] mod_fcgid: read data timeout in 120 seconds, referer https://updownchecker.com/e207f252-1fcb-e311-93f4-00155d368c3c
[Wed Apr 23 12:43:20 2014] [2280457] [core:error] [client 95.128.56.36:52325] End of script output before headers: index.php, referer https://updownchecker.com/e207f252-1fcb-e311-93f4-00155d368c3c
[Wed Apr 23 12:43:20 2014] [2280457] [fcgid:warn] [client 95.128.56.36:52326] mod_fcgid: read data timeout in 120 seconds, referer https://updownchecker.com/e207f252-1fcb-e311-93f4-00155d368c3c
[Wed Apr 23 12:43:20 2014] [2280457] [core:error] [client 95.128.56.36:52326] End of script output before headers: index.php, referer https://updownchecker.com/e207f252-1fcb-e311-93f4-00155d368c3c
[Wed Apr 23 12:43:21 2014] [2280457] [fcgid:warn] [client 46.17.46.227:55836] mod_fcgid: read data timeout in 120 seconds, referer https://updownchecker.com/e207f252-1fcb-e311-93f4-00155d368c3c
[Wed Apr 23 12:43:21 2014] [2280457] [core:error] [client 46.17.46.227:55836] End of script output before headers: index.php, referer https://updownchecker.com/e207f252-1fcb-e311-93f4-00155d368c3c