Lately a lot of account very active in trading especially Pump/ dump tactics have been banned or suspended
Now bittrex issued an official statement:
“We occasionally conduct compliance reviews and are working vigilantly to protect our service and our users from harm. As part of a compliance review, we have temporarily suspended certain accounts pending the completion of the review. The total number of suspended, closed, or banned accounts is very limited: less than 0.1% of the total accounts on Bittrex. More than 99.9% of Bittrex accounts are unaffected.”