According to U.Today, the altcoin mining pool 2Miners reported that they noticed that the computing power of the ant mining machine E3 had fallen by 5/6 and contacted its producer Bitmain. On February 21, 2020, 2Miners began to receive complaints from miners using the E3 ethash ant mining machine, claiming that the mining machine's computing power dropped from 180-200 MH / s to 30 MH / s. The company launched its own investigation and the results were as follows: From the beginning, miners determined that the problem might be caused by an increase in the amount of DAG files. A directed acyclic graph file or DAG file is generated during each mining period, which is used to start the Dagger Hashimoto algorithm (ethash) to find block solutions in altcoin mining. The capacity of this file will increase with each mining period. For ETH and ETC, it will last approximately 30,000 blocks or 5 days. It is reported that the growth of DAG files has limited the use of ethash mining GPUs in 2017-2018. Based on this assumption, 2Miners received a reply from Bitmain today: E3 is related to the ETH algorithm, and the DDR capacity has reached the upper limit, so E3 will not be able to continue mining-this means that E3 can only be mined until January 2020. 2Miners also calculated that ETH will be discontinued within 5 weeks.