It's a crappy wheel. The wheel my $300 bike came with broke spokes like they were made of spaghetti. 12 in less than a year. It was always out of true.
I bought a new rim (double walled) and some spokes, made a stand out of 2x4s, sat down in front of the TV with Sheldon's wheel building page, and built myself a wheel. Never had another broken spoke and it stayed dead true for 16000 miles, until finally the axle broke (it was a cheep freewheel hub). I replaced it with a Wheelsmith built wheel, which has been going for 6,000 miles now and also no problems.
__________________
Work: the 8 hours that separates bike rides.