Do you have any logs from the output? It might indicate if the server said the edit failed, but it didn't in actuality. It could also be an issue with the internet connection your bot has, as dropouts would cause the connection to retry. Though I'm not familiar with the total internal workings of pywikipedia, I can try and help. 300kb+ is big, but I would like to think the servers could still handle it. You might want to put adding notices to that users page on hold though, for the sake of the size and them not editing in 2 months.

DeltaQuad
English Wikipedia Administrator and Checkuser

On Fri, Oct 26, 2012 at 2:33 PM, Morten Wang <nettrom@gmail.com> wrote:
Hi all,

I noticed that SuggestBot's struggled with saving a user page earlier
this week, see http://en.wikipedia.org/w/index.php?title=User_talk:The_Master_of_Mayhem&action=history
 Notice the larger number of saves that have a diff size of 0 bytes.

I suspect it's due to the size of the page, 300+kB, is this a typical
problem?  If not I can start digging to see if I can figure out what's
going on. If it is a common problem, what are some typical ways of
solving it?  Just checking the page size and skip/abort if it's too
large?


Regards,
Morten

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