Can I ask if anyone has got xcarlink in their Jazz? If yes how did yours run so far?

I recently got a xcarlink installed in my Jazz to play mp3 files from my USB stick. However, I noticed there's a constant low but annoying noise sound in the background, also theres occasional momentarily pause. I tried different mp3 files, different USB sticks and SD cards, but I still got the same problem. I tried to talk to the seller but he doubted its the problem of my USB stick and mp3 files. I wonder if anyone has the same experience?

Note: the low but annoying noise sound in the background only becomes obvious when you play the soft music, it wouldnt be noticeable if you play rock & roll stuff!

Thank you very much!!