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28335串口在线升级有时成功有时失败

做28335串口在线升级,有时候可以升级成功,在升级成功的应用程序中修改了几个函数内容,CMD等都未改动会出现升级后没有反应,观察flash都是已经写入。boot loader工程用调试模式,此时flash写入后,跳转到应用程序起始地址,后面就跳出illegalisr()。如果把修改的内容(很简单的赋值操作)去掉,则升级又成功。请教一下这是什么问题?