Hadn't had an issue with this mod for over a year, until about a week ago.
Sitemap generations started giving Internal Server Errors (500) when generating a new sitemap. After trying a ton of different things to try and resolve it, I was finally able to get a sitemap to build without error by turning off "Auto-Notify Search Engines" in the settings. The time for creation of the sitemap after doing this went from an average of taking about 12-14 seconds over the last year down to taking less than 1 second (still getting all the links) with the auto-notify off.
This got me to thinking that when contacting the search engines it is waiting for some sort of response. The "500 Internal Server Error" error I have been getting over the last week with auto-notify turned was erroring out at about 1 min and 14 secs after starting the sitemap generation, which is exactly 1 minute longer than the standard creation time I had been seeing, so I believe the server is just timing out waiting for a response that it use to be getting before the last week or so.
Can someone report if they are having similar issues.
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Edit: Seems to definitely be related to just that one "Auto-Notify Search Engines" setting: Setting ON - get error, Setting OFF - works fine
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