Question, as you already see in the title 6/13 account DC'D from server EXACTLY at the same time. Than one more dc'd 10 seconds later. (7/13) I personally logged them back in, is this just coincidence or purpose? I immediately checked my mails, no pass change mail etc. This got me scared quite abit. Has this happen to someone before?
Generally if you are botting multiple accounts on the same PC if one wow lags it could temporarily lock up some of your other ones and make them dc at the same time. Also if you use a relogger make sure that its not the relogger thinking wow is stuck then restarting them all. If they all DC at the same time then your password changes then you are getting banned. Other then that its just coincidence / how it works not blizzard messing with you.
This is EU. Nothing has happen yet. so far, so good. As for Relogger I rather not use them because I take (on purpose) alot of time for each account to start. (E.g. walking to some other Area, buy something on AH, do a daily for each client.)
Ibe bad internet spike could also result in all disconnecting. If the game thinks you lost connection it makes sense that all would disconnect. Thor dropped his hammer on your Internet temporarily.