Originally Posted by JeffS
If the spokes were properly tensioned this wouldn't be happening at all.
If you bought the bike new, I'd take it back to the shop, expecting them to retension the rear wheel for me.
I have a clydesdale mate and he bought a Giant MTB several years ago. Bike was in the cheaper range but he had several spokes break in the the first couple of rides. The LBS got replacement wheels from Giant as the rim had become/ or was/ Oval when they went to replace the second broken spoke and it would not retrue. That second set of wheels were better but were still not that good. Second pair broke a spoke after a month and they were sent back again. Giant replaced them with a better set of wheels and they were OK.
Giant treated my mate right, but I think this was mainly due to the shop.
Spokes should not need retensioning very often- After a year of use possibly or if you knock them out of true. Get the shop to check the wheels under warranty as unless you have mistreated them- they should be able to do the job properly.