I bought a Raleigh Mojave 8.0 2 years ago, swapped out the mountain tires for slicks, added a rack and made some fenders, and the first time I rode it the crank fell apart. It wasn't even 3 miles when the crank arm fell off. I took it back to the LBS, they apologized and fixed it and gave me an extra year of free tune ups. I have gone back for the tune ups but nothing else has been wrong with it in over 8,000 miles.
So maybe it was just bad luck like mine was and your bike will be fine from here on out.