Hello , after LONG TIME checked ,
I notice it is because of RSS2 generate the link "......html&language=en" , It is wrong link
Correct one should be "......html?language=en",
Then my screambuy don't know the difference of "&" and "?" , provide "page not found , 404 Error" message .
Is it a bug ?
I suppose there are some such situations , but look through whole interenet and no answers .

It must be solved because Google Bot always regard it as a new link but in fact it is not work , cause a lot of trouble during SEO .

Hope that it can solve fast .