Husqvarna is owned by Electrolux. Electrolux also owns Poulan/Weedeater. Guess who ACTUALLY manufactures the Husqvarna brand string trimmers?
Although the Husqvarna trimmers are a step up from the standard Weedeater models, Weedeater has never manufactured high quality designed and built trimmers like Echo or Shindaiwa builds. Weedeaters have always been built cheap to sell cheap. Like the old saying goes, you get what you pay for. Having said that, most homeowners will not know or appreciate the difference and should get a reasonable amount of use out of them, but not necessarily trouble-free use, as you have already discovered.