I must say this is a great plugin. But for the past 10-20 days, I am repeatedly getting 500 error. When I contacted my hosting company, hostgator, they told me that this plugin is generating too many queries & hence, this is causing my hosting acct touch limits and hence, 500 errors. The support rep advised me to remove this plugin which I have not done so far. But I disabled the sitemap option. Now still getting the error. I am actually not wishful to disable this wonderful plugin.
Now, I'd like to ask the author to check this and let us know if this actually generating too many queries.
Any help will be appreciated.