https://bugzilla.wikimedia.org/show_bug.cgi?id=55219
Fæ faebug@gmail.com changed:
What |Removed |Added ---------------------------------------------------------------------------- CC| |faebug@gmail.com
--- Comment #7 from Fæ faebug@gmail.com --- Checking this morning with Faebot, 1.6% of get/put transactions have failed out of a sample of more than 1,000. These were small size category changes rather than file uploads or large page edits. I believe most failures have been on putting pages rather than getting them, but I have seen getting pages causing this failure.
As everyone appears affected, not just API users, I have asked for feedback at the Village pump (http://commons.wikimedia.org/w/index.php?title=Commons:Village_pump&diff...).
I am not convinced that this is a pywikipediabot specific problem, it does not relate to any changes in pywikipediabot which has never before had this problem with this frequency, so the bug report (1399) above may well be a dead end.