weird problem with bluetooth headset

[bmatic586]

i just got a plantronics voyager 510 per advice from all of you guys here, and i have a problem with it.
if i'm using it and it's connected to the phone and everything, and if i press the red on button to check time on the phone and press it again (or leave it alone) and when the phone turns off the screen again, it disconnects the headset and the phone. is there any way around that?

also, is there anything that you guys recommend as far as what is the best way to make sure that it keeps being paired with the phone.

thanks.