I agree with ChartMan, I have never liked buying at the all time high
Next broke above the upside resistance level of 817.00, 34 days ago, which should now lend downside support. I think we have a flag in a down market; this is a controlled period of profit taken, or loss consolidation. As ChartMan said use your stops, and watch for downside breakout.
Please DYOR, I am not an expert