Other catalysts are being blamed, including weaker-than-expected durable goods and PMI services reports on the economic front. Apple ( AAPL ) is dragging down the tech sector in a big way due to software bugs and the " Bend-gate " problem related to users reportedly bending the iPhone 6 Plus model by simply leaving the device in their pockets while sitting. Others point to the historic record of September being a difficult month for stocks. And I've even seen the old "sell on Rosh Hashanah, buy on Yom Kippur" excuse trotted out.