I've searched this forum for some time without finding an answer to this issue. I recently purchased a P1 BT headset for my 650, and it works well except that without reason the light will quit flashing when it is in standby mode. It still takes & makes calls, but it makes it difficult to tell instantly whether it is on or off, and it makes it difficult to tell how long to hold down the button to turn it on or off (flashing light indicates on/off change). I asked the placed I purchased it from and was told this was a common problem with the P1 headset. Anyone else experienced this? Thanks for your time.