On a ride recently my front derailleur seems to have gotten jammed. The levers wouldn't index and the derailleur itself wouldn't budge. After continuing the ride for a bit, the problem went away on its own. What could have caused this? And how can it be fixed more quickly in the future?
It is a Shimano Deore derailleur, and it was stuck in the smallest chainring position. The bike is new with less than 50 miles on it.