Because Xiao Ze was only 13 years younger than his father Emperor Gao, and he felt that he contributed greatly to the establishment of Southern Qi, he often interjected himself into governmental matters, and he often used items that were properly only usable by the emperor. He also trusted his jester Zhang Jingzhen (), who was so luxurious in his lifestyle to be like an emperor. When the official Xun Boyu () reported this to Emperor Gao while Xiao Ze happened to be away from the capital Jiankang to worship the ancestors, Emperor Gao was enraged. Xiao Ze's brother Xiao Ni the Prince of Yuzhang found this out and quickly rode on a horse to personally warn Xiao Ze. Xiao Ze quickly returned to Jiankang, and the next day, Emperor Gao sent Xiao Ze's two sons, Xiao Zhangmao the Prince of Nan Commandery and Xiao Ziliang the Duke of Wenxi, to rebuke Xiao Ze for him and to order Zhang put to death in Xiao Ze's name. It took about a month for Emperor Gao's furor to subside, after a feast organized by the official Wang Jingze () at the crown prince's palace. For some time, however, Emperor Gao considered replacing Xiao Ze as crown prince with Xiao Ni, but because Xiao Ni continued to serve his brother faithfully and carefully, their brotherly relations were not affected.