I had key #9 programmed to bring up the "Disconnect" contact, and it worked for a while but stopped working. I tried moving this contact to key #7, but it still doesn't work on key #7, but other contacts work on both keys, so the problems is not a faulty key. And if I select "Disconnect" from the cotacts menu, it works, so the problem isn't the contact or the repeater. What could the problem be? And while we're on the subject, how important is sending the Disconnect signal each time I switch channels or shut off the radio when I am finished using a digital channel? My handheld is a YJT (Hizbao) DM-602.