If you can’t handle an update, you’re eventually going to get left behind and when you run into future problems, you’re not going to be able to solve them.
If you’re updating and this is happening, I would definitely have a look at what you’re actually putting in your Child theme and how you’re handling your files. I honestly am kind of stumped to what you could be doing that would cause this, but something you’re doing is just not right.
Can I see what’s in your Child theme’s functions.php? — http://www.pastie.org