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How to explain quick price changes early in the morning
http://www.marketwatch.com/optionscenter/calendar would note some options expiration this week that may be a clue as this would be the typical end of quarter stuff so I suspect it may happen each quarter. http://www.investopedia.com/terms/t/triplewitchinghour.asp would note in part: Triple witching occurs when the contracts for stock index futures,   stock index options and stock options expire on the same day. Triple   witching days happen four times a year on the third Friday of March,   June, September and December. Triple witching days, particularly the   final hour of trading preceding the closing bell, can result in   escalated trading activity and volatility as traders close, roll out   or offset their expiring positions. June 17 would be the 3rd Friday as the 3rd and 10th were the previous two in the month.