being that i have worked and managed a shop for sometime, i can see that a bike could leave the shop with a misadjusted hub, crooked stem, etc... sometimes it is very difficult to have every bike perfect when dealing with noob/jr mechs/emplyees. i would love to have the time to check every new bike and every repair that goes out the door, but i cant split in two. although, at my shop there is absolutely no way a custom build would leave mis-adjusted, but i could see a stock bike outta the box leaving with a minor problem.

but, the OP stated he noticed the problems throughout a week, a brand new properly adjusted hub can come out of adjustment in a week. id rather have a hub leave adjusted that may need re-adj in a month, than have the bearings binding! competent shops offer maintence service to new bikes, to catch this type of problem.

curious, what kind of hub is it?