The stock of Walt Disney Co (NYSE:DIS) has reached a 52-week high, but Jim Cramer has advised investors to be cautious. What Happened: On Tuesday, Cramer, the host of CNBC’s “Mad Money,” suggested that it might be time to trim Disney’s stock, reported CNBC. The stock has surged by 25% this year but Cramer believes that the reasons behind this rally are questionable. Disney is currently embroiled in a proxy battle with activist investor Nelson Peltz, who has been critical of the company’s management. Despite the stock’s recent gains, Cramer is skeptical about the sustainability of this growth. …