the 6230 sticks on the headset profile

Hi,
for some reason, it has been sometime, that my phone keeps returning and sticking to the headset profile without the headset stuck on it. There is this icon on the screen and i can ot use it that way. When i stick the headset and i unplug it, it gets back to normal, for only for a couple ofhours. then it goes to that profile automatically and remains there. I click on the Normail profile, it is ticked, but it remains on the headset one. What do you think i shoud do before taking it to the nokia service?
Thanks