Apple Inc. (NASDAQ:AAPL) experienced a stock rally on Monday, but CNBC host Jim Cramer is skeptical about its sustainability. What Happened: Cramer expressed his doubts about the longevity of Apple’s stock rally, which was fueled by an analyst’s upgrade. He cautioned investors to hold off on purchasing Apple shares, reported CNBC on Monday. On Monday, Bernstein‘s Toni Sacconaghi upgraded Apple shares from neutral to buy, citing the stock’s potential for a robust iPhone 16 cycle and a temporary downturn in China. Despite this, Cramer advised investors to wait and see, especially with Apple’s ea…