Xperia PLAY :: Bluetooth Disconnects - MW600 & HBH-DS220?

I'm using Xperia Play & having disconnection problems with BOTH Sony Ericsson HBH-DS220 & MW600. Initially I thought it was HBH-DS220 not playing nice with Android, so I bought MW600 Last Saturday, but sadly Problem persists.Problem Description: Simply put, I'd be lucky to finish a phone call over the bluetooth headset without it dropping connection. The MW600 would still display the telephone number, while in fact no sound is coming or going through, and then it takes a few seconds for the "Bluetooth" toggle button on the phone call UI to disappear. Whenever that happens, I'll have to frantically yank off the earbud, take out the phone, and start appologising to the other person for missing the last few seconds of conversation.It would also sometimes lose connection when I'm playing games, the sound would stop coming in from the game, then the game will freeze for a second or two, and suddenly the sound would start coming out from the the built in loud speakers and give everyboy else a heart attack.i'm using stock firmware, never rooted/unlocked:

Model number: R800i
Kernel: 2.6.32.9-perf SEMCUser@SEMChost #1
Build Number: 4.0.2.A.0.58

EDIT: On another note, after posting this, I found I have put my email as the displayed username... (I already have an account over at blog.sonymobile, and over there, username means email address. So I put my email address when I log on here, the button says something like "create account"... yes, its a bit weird, yet plausible since I was thinking you're confirming my email before proceeding onto anothe create account screen. There was no warning THAT username is the one going to be displayed.)