VladimirAlexiev added a comment.
The reason is overloading of the WD backend, therefore throttling of update rates of any particular user or tool. I had similar issues with adding 1.5M "Worldcat Identity" identifiers, together with "source: <VIAF ID>". QS has to edit the whole item to add a couple of statements. If the first statement (adding identifier) times out, then the second one (adding its source) fails and reports an error. This issue is not easy to fix. And people resubmitting their batches exacerbates the issue because it then leads to duplicate statements, eg see https://www.wikidata.org/wiki/Property_talk:P7859#avoiding_duplicates TASK DETAIL https://phabricator.wikimedia.org/T250386 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: VladimirAlexiev Cc: VladimirAlexiev, Aklapper, Magnus, Csisc, darthmon_wmde, Nandana, Zylc, 1978Gage2001, Lahi, Gq86, GoranSMilovanovic, DSquirrelGM, Jayprakash12345, Chicocvenancio, QZanden, Tbscho, LawExplorer, JJMC89, _jensen, rosalieper, Scott_WUaS, Wikidata-bugs, Jitrixis, aude, Gryllida, scfc, Mbch331, Krenair
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