Forward-looking market.
I think it's because investors are thinking that the memory market has bottomed so the future for Micron at its current stock price is flat to up, and they don't want to be late and pay too much for the stock later.
So longer term holders are willing to buy the stock and hold it from here wile traders -- believing that a sustained upward move may be a quarter or two in the future -- are more willing to trade it. If this is true then expect MU to trade within a flat channel for a few (to several) months before trending higher.
It could be worse: in prior cycles MU would operate with losses during memory cycle minimums, but this time it appears they will continue to make significant profits during the cycle low. I think that is due to the high sophistication of the technology and the lack of capable competitors that results from that level of sophistication (and patent coverage).