I have trouble with my chain popping off while riding pretty often, and that's even right out of the shop to get the chain tightened. (I'm not sure how to tighten a three speed hub.)
About once a week or so (I ride about 60-100 miles/week) i'll be riding and suddenly lose power and brakes.
I ride entirely in the road, but the roads here have been described as being "more technical than some singletrack" to me.
What do I need to do, if anything? How often do chains drop normally?