I am having an issue with the headset button on my Mitel phone. When I press the button it lights up properly and I am able to use my wireless headset without any issues. However if I use the button on the headset to hangup the call or I put it back on the base, the Headset light goes off. So now I need to press it every time I want to use the headset, instead of it just staying on. This just started recently after a software upgrade, and I am wondering if there a way to make sure it always stays on. Thank you.