Fastport errors

Ok here is my problem.

I got a K750i @ W800i flashed just some days ago. When flashed with a new firmware, the headphones connect easily without any sort of wiggling or something, just pluggin' them in worked...

But then since yesterday somehow i am not able to connect the headphones easily without wiggling and all. Sometimes it gets disconnected easily in the software, without even plugging out the connector...

I just don't understand why. i tried to check the phone's fastport by connecting it to a DCU-60, and it got connected, though it gets disconnected even if the phone is moved even by a inch which makes me think that it is probably a loose connection within the phone.

I tried other DCU-60s and headphones(HPM-60, HPM-75, HPM-70) in my friend's PCs and their headphones too, but its the same everywhere. So it's surely the phone's fastport error.

The port is always clean, as i maintain the phone every 2 days or so,
and don't let moisture settle on it. . .not even a bit. So its not a dust/moisture error anyway. Reckon its a yr and a half since i bought the phone.

Is it normal for the fastports to get error after some possible time?? Can it be replaced by the Sony Ericsson Center? Because dad has no plans to upgrade my phone this yr. I wanna repair that fast port anyhow, whatever be the charge . Can it be done

have it replaced.. for me the fastport is my only criticism of SE products..it is both a blessing and a clumsy headache for me.

Nice :) for me its cool