Rep Power: 258

I'll start by saying it's an aftermarket horn, and I installed it myself with NO experience doing that before. Anyways my horn usually works fine, if I beep it once in a while. But if I were to hold it down for a bit, or maybe even 10 consecutive beeps, the sound would start to distort, fade, eventually completely die out and when I press it wouldnt work. Five mins later I'll try again and it'd work but in it's dying tone. The next day it would work 100% again. It's happened already like 3 times. Any idea what the problem would be?

 
Rep Power: 308

Poor electrical connection or grounding ??

 
Rep Power: 302

Usually grounding.