突然跳水，原因找到了

Market Overview - The A-share market experienced a decline, with the ChiNext index dropping over 2% on September 26. The Shanghai Composite Index fell by 0.65%, the Shenzhen Component Index decreased by 1.76%, and the ChiNext index closed down by 2.6% [2][3]. Market Statistics - The total number of stocks that rose was 1,805, while 3,414 stocks fell. There were 58 stocks that hit the daily limit up, and 24 stocks hit the daily limit down. The total trading volume reached 21,661.07 billion [4]. Sector Performance - The consumer electronics sector saw significant declines, with major stocks like Xiaomi experiencing a drop following the release of its 17 series smartphones [12]. - The gaming and AI application sectors also faced downturns, with stocks like Gigabit Technology hitting the daily limit down [6]. - The semiconductor sector showed divergence, with companies like Huahong Semiconductor reaching new highs, while companies like Lianang Microelectronics faced significant declines [7][8]. External Influences - The market's weak performance may be attributed to several factors, including the upcoming National Day and Mid-Autumn Festival holidays, which typically lead to a cautious approach from investors [10]. - Fund managers may be adjusting their portfolios as the third quarter comes to a close, contributing to market volatility [11]. - Recent announcements regarding new tariffs on pharmaceuticals, heavy trucks, and furniture by former President Trump have added to market uncertainty [14].