A股突发跳水，背后发生了什么？

Market Overview - The Shanghai Composite Index briefly surpassed 3700 points before experiencing a sharp decline, with over 4600 stocks falling [1][2] - As of the market close, the Shanghai Composite Index fell by 0.46%, the Shenzhen Component Index by 0.87%, and the ChiNext Index by 1.08% [1] Stock Performance - A total of 735 stocks rose, with 52 hitting the daily limit up, while 4648 stocks declined [2] - The total trading volume reached 23,062.83 billion, with a total trading quantity of 152,614.8 thousand [3] Sector Highlights - Digital currency concept stocks showed strength, with Hengbao Co., Ltd. hitting the daily limit up [3] - Brain-computer interface concept stocks remained active, with Innovation Medical sealing the board [5] - Robotics concept stocks saw localized activity, with Wolong Electric Drive hitting the daily limit and reaching a historical high [6] - Semiconductor stocks surged, with Cambrian Technology rising over 10% [7] Notable Declines - The aerospace sector experienced adjustments, with Changcheng Military Industry hitting the daily limit down [8] - The stock price of Changcheng Military Industry has increased by 115.1% over the past trading period, leading to concerns about potential suspension for price verification [8] Market Dynamics - The index's breakthrough of the 3700-point mark is seen as facing short-term adjustment pressure, with the need for increased trading volume to sustain the upward movement [9] - Recent data from the central bank indicates a significant increase in non-bank deposits, suggesting a shift of household savings into equity markets [9] - Some banks have issued warnings against the use of credit card funds for stock market investments [9]