It works fine for me, too. I don't understand why anecdotes of problems are seen as interesting data points (for anyone other than the developers attempting to improve the software), especially in a community of technical people who presumably have some decent grasp on probability. This could be explained just by buggy hardware, or hard drive corruption, or any number of things. It's also not unique to Ubuntu.
See also:
1. My iPhone 4S crashed randomly when I got it.
2. Google "windows 7 freezes randomly" -> 74,000 hits
https://www.google.com/#hl=en&safe=off&q=+site:answe...