It might be down to the fact that back in May someone tried to launch a class action lawsuit against them for alledged insider trading for the Ether pair:
https://www.cryptocoinsnews.com/jilted-trader-organizing-class-action-suit-poloniex/
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Could be. I and others have suspected that they may be doing some kind of insider trading but there is no way to prove it. That would also make sense if they were insolvent and trying to use any means they can to make up for it. Some of their down time and suspensions seem to happen at very suspicious times. Thanks for the link.