We would need to know more about your computer. I have Music Maker 16 and I have yet to have it freeze. It does take a bit for it to start up, but other then that it seems to be pretty stable.
You issue could be resources, it could be other applications that are installed in the comptuer that are running at startup. It is hard to say why this is happening to you though without more information.
I'm having the same problem, with nothing else running on a 'high-spec' system i.e. pleanty of RAM, Hard Disk Space, processing power etc. I have to press CTRL + ALt + DEL, to stop MM16, as a process. I'll let you know if it clears, and why and how if I can.