NEW YORK, Oct 28 (Reuters) - SanDisk Corp shares fell 2.5 percent to $22.12 in premarket trade on Wednesday after Goldman Sachs cut the flash memory maker to "neutral" while Texas Instruments Inc gained 1.3 percent to $24.11 after the firm boosted the company to a "buy." (Reporting by Chuck Mikolajczak) Keywords: MARKETS STOCKS BEFORETHEBELL