has any1 had any trouble w. the 3.5mm adapter for music

Ive gone thru 3 of them, the 1st two i purchased were already defective when I first started using them, the 3rd i bought from handhelditems.com and it worked fine for several months and suddenly out of nowhere the bass is completly MIA...im sick and tired of shelling out money for these adapters...i think that there are a few reasons that might be contributing to this
1) the adapters have all been extremely loose in the proprietary jack
2) i have recently fooled around w. the sound volume by hacking into the fone and maybe it was too loud for the adapter...I am not sure that this is it because the adapter was working for several months previous to breaking

also...is it worth it to just scrap the whole adapter and get a blue tooth set...if so how much would a decent one run me?....thanks