The lid will not lock and stay on during churning
Here is a link to the manual if you need it;
It sounds like somehow the little locking lugs on either the lid or the bit it locks to have broken off. if it is the lid, then you should be able to get a new one from cuisinart - check the manual for details, otherwise you probably have to either try and rebuild them by carving another piece of plastic the same and glueing it on. a new body piece may be available, check with cuisinart, but my guess is that you are stuck with tape - or my idea would be a large rubber/elastic band, so you can re-use it.
Hope this helps :) Read More At : ICE-30BC 2 Quart Ice Cream Maker...