well, I see that you have your host to do this job. I have google fetching it for me on their scheduling area. I found this easier as I had issues attempting to have my host do it.
And..I have mine updating every day as well. My wife will go through and update our website products every few day swith on hands, active products, etc. I found it easier to just do it every day instead of having to do it every single time we update so it minimizes the 404 errors.
I also just have a cron job setting up my google feed to run and create the feed daily. then its made sure its accurate. Then when google fetch the file, their just pulling that file.
It sounds llike your host is renaming the file every time. and not to overwrite the file. So....changing it to do it like i have may correct your issues.
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