I think you should open a support ticket as this is getting a little long and it's not a support thread, just a place for suggestions. Sounds like you have something else going on there, and I'm sure the team might be interested to try to help with it as it's a kind of random thing that happens only to some people. Not sure why. Some lose their snippets every time they update and some don't, same with pretty much all other customizations which aren't really part of the program setup for saving them.
Anyways, please open a ticket rather than continuing here and if I remember later I'll move your posts to a new thread so you can continue commenting there if you like
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