The Tokyo Stock Exchange returned to normal operating hours Monday, with the afternoon session starting at 12:30 p.m., ending three months of shortened hours to prevent the exchange’s computers from crashing.

The TSE had delayed the start of afternoon trading by 30 minutes to 1 p.m. since Jan. 19 to limit the volume of trading. The exchange was forced to suspend trading in all shares the previous day when the system failed due to a surge in sell orders triggered by allegations of improper accounting at Livedoor Co. The Internet firm was delisted April 14.

The number of daily transactions has stabilized and the TSE said April 21 it would resume normal trading hours Monday.