The plugin works great, been using it for a very long time. Plugin generates the sitemap without any issues. Then, randomly it will fail to generate a sitemap. I found this out because Google Webmaster Tools suddenly gave me an error on the sitemap saying it couldn't be read...
I go into my wordpress install, and it has the following error:
"The last run didn't finish! Maybe you can raise the memory or time limit for PHP"
I hit rebuild the sitemap, it does it without issue, but then a few days later, this issue will reoccur.
Note: Memory has already been raised in php.ini file, as well as up to 16 within the plugin options.
Any thoughts would be greatly appreciated.