My Ti Provi (3of them) never experienced this separation...
I would not accept tech support telling me to just tap it with a hammer either!
But that is what they will tell you to do. I dropped one of my minis (not a Ti) on a cement floor and the top cap almost popped completely out. Having previously read directives from the Mothership, I took out the battery, made sure the wires were tucked in, turned it upside down, and then slammed the top down on a padded vinyl tabletop. It popped back in good as new.
			
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