Anyone else having this problem?

After trying numerous BT headsets (i.e. Scala, etc.), I finally settled on the Treo BT headset. It was working fine till recently...even though it shows that it is paired correctly, it just does not connect during a call. I am making calls with the Treo 650 itself, of course, but the headset never kicks in. I deleted the pairing on my Treo and re-paired it and still no luck. I am about to send it back (I am still within my 30 days) unless someone can help me.