they are disable some people accounts with out any clear answer! I do not know what they did do to now from 11th Oct! they must answer their clients.
It's doubtful that they are disabling the accounts for no reason, you should contact their support if you feel there's been a mistake.
Bittrex one of the largest altcoin trading exchange has announced its new trading policy.This announcement comes hours after it witness a DDOS attack on it software.The tweets from bittrex @bittrexexchange comfirmed that attack.
What Is DDOS Attack?
A Distributed Denial of Service (DDoS) attack is an attempt to make an online service unavailable by overwhelming it with traffic from multiple sources. They target a wide variety of important resources, from banks to news websites, and present a major challenge to making sure people can publish and access important information.
This attack could be the reason why it decided to adjust it trading policy to unloads it software of irrelevant trades and information. In an email sent to all it subscribers its reads.
Read More At
https://bitzamp.com/bittrex-issue-new-trading-policy-traders/Likely trying to reduce the load on the server at all times so it's not so vulnerable to attacks. Doesn't really effect anyone that much as new orders can just be submitted. I imagine they had hundreds of standing orders which were submitted by inactive accounts just taking up resources.