I have been using a MH100 bluetooth handsfree for quite a while. Today, when I was answering a call, all I could hear was a loud noise, and two leds a lit up blue (constantly). I have turned off BT on the phone to disconnect, but the MH1000 is still showing two leds, and producing noise. Does not respont to any key press.
I haven't experienced this problem before with my MW600. Has it been damaged in any way recently? If it continues to behave like this, I'd recommend you take it to an authorised engineer for examination.