Light bulb replacement
How many off and on cycles did they go through? A fluorescent, compact or otherwise, that is turned off and on frequently will not last as long as one that has not gone through too many turn-ons even if the latter has had somewhat more burning hours.
Are the lamps pointed or facing down with the ballast units directly above? Are the lamps enclosed by a shade or diffuser? This can result in a higher temperature inside that shortens the life of both bulbs and ballasts.
The disadvantages of crab apple trees. In summer, the apples are too sour to pick and eat. In winter the birds come and leave dropping all over the place.