My Bluetooth headset Philips SHB6610 has several profiles. It can work as low-quality headset (HFP) and high-quality headphones (A2DP). I mean sound quality. Typically whenever I start to play the music in my media player it works in high quality, while if I receive a call on Skype it switches to low-quality. Once call is finished it falls back on high quality again.

However, from time to time, it happens that I connect headphones to the computer and they just stay in low-quality mode. I don't know how can I change the profile manually, since it was always done automatically so far.

The only thing that helps (but not always) is re-pairing of headphones with PC. I am using Windows 7 on Toshiba Satellite Pro P300-1CG laptop, with Belkin Mini Bluetooth Adapter.