The electronics giant is focusing on entertainment sales, but there's a catch to owning shares.Stock splits have suddenly become the rage this year. Electronics giant Sony Group (SONY -0.16%) has thrown its hat into this ring, joining companies such as Nvidia and Chipotle.Sony announced a 5-for-1 forward-stock split to take effect Oct. 1. While this action lowers the price of individual shares, making them accessible to more investors, it doesn't necessarily mean Sony stock is a buy.Also, determining whethe ...