Most likely your menu.bat has an exit command or something similar in it, which would cause startnet.cmd to finish. You need startnet to start something else that will "hold" it open, such as a start /w cmd.exe.
bump my question wasnt answered @nycste Hey there. This is Joe from http://www.systemsabuse.com. John is currently looking into the issue above and I've pointed him to this thread so he can let you know when it is resolved. Hope this helps somewhat.