Here is the reply from the CEO of Binance
"We encountered a technical performance issue (related to in-memory locking) during the TRON ICO. It took some time to narrow down to the specific issue. The issue has been fixed. All 1.9B TRX has been sold successfully, all purchase records are processed correctly. The same problem will not occur in future ICOs. We apologize for the inconvenience.

The problem did not affect Binance exchange trading.

Thank you for your understanding and unwaivering support.

Binance Team

August 24, 2017"

Source https://binance.zendesk.com/hc/en-us/articles/115001264451