Who else has iPhone 5 chargers constantly stop working?

I have bought 5 Apple brand chargers in the last month and all of them have stopped working within a week. No it is not my phone and the charging dock works fine. The chargers just seem poorly built and I was wondering who else has this problem. Apple should really work on building Iphone 5 chargers that actually last since they changed the charger with the Iphone 5. Otherwise millions of people will be spending money on chargers making Apple richer and richer without them ever having to actually adress the issue or offer replaces without having to spend hard earned money.