I noticed this spike [1] in editing errors on mobile so have investigated it. These were the types of errors occuring on that day [2] NULL 23 autoblocked 5 badtoken 8 blocked 88 editconflict 2014 HTTP error 69 nosuchsection 8 pagedeleted 1 protectedpage 246 ratelimited 34 rvnosuchsection 7 Sadly 1649 of these users were trying to make their first edit [3] And most of these problems were on enwiki [4]: dewiki 5 enwiki 1997 eswiki 1 frwiki 4 jawiki 1 kowiki 4 ptwiki 1 ruwiki 1 Looking closer at the timestamps the majority of enwiki errors (1909 of them) happened between 1am and 3am on Tuesday the 19th November UTC [5] with 1844 of these occurring between 2.30am and 3am [6]. This would be around Monday 18th November 5pm-7pm PST. All these edits happened in stable mode. Does anyone know why might have been responsible? [1] http://mobile-reportcard.wmflabs.org/graphs/error-edits [2] select event_errorText, count(*) from MobileWebEditing_6077315 where event_action = 'error' and timestamp > 20131119000000 and timestamp < 20131120000000 group by event_errorText [3] select event_errorText, count(*) from MobileWebEditing_6077315 where event_action = 'error' and timestamp > 20131119000000 and timestamp < 20131120000000 and event_errorText = 'editconflict' and event_userEditCount = 0 [4] select wiki, count(*) from MobileWebEditing_6077315 where event_action = 'error' and timestamp > 20131119000000 and timestamp < 20131120000000 and event_errorText = 'editconflict' group by wiki [5] select wiki, count(*) from MobileWebEditing_6077315 where event_action = 'error' and timestamp > 20131119010000 and timestamp < 20131119030000 and event_errorText = 'editconflict' group by wiki [6] select wiki, count(*) from MobileWebEditing_6077315 where event_action = 'error' and timestamp > 20131119023000 and timestamp < 20131119030000 and event_errorText = 'editconflict' group by wiki