HTC One X Bluetooth connectivity issue

Err… I start to hate HTC One X. HTC is not the company that produce great smartphone like before. HTC HD2 is the best smartphone from HTC that I own. HTC One X really cannot keep up the standard that HTC HD2 set (or maybe other company like Samsung is pushing up the standard). I found another issue on my HTC One X. Yes, latest HTC One X issue ~ Bluetooth connectivity. I always listen to MP3 while washing my car. Connected to Sony Ericsson MW600. No issue with Samsung Galaxy S II. But HTC One X faces skipping, get disconnected and signal loss issues. And have poor Bluetooth coverage range too. Is this firmware issue or hardware issue?