I have a Avaya CM Release 6.2 that has been installed for about three years. In the last two weeks we have seen phones randomly rebooting and it is getting worse. The phones are in different area's of the building, so different network switches ( Extreme POE ). My thought was something on the network has changed, DHCP server, but the network group says no. They are working with us but no one seems to be able to figure it out. We have a couple phones that will reboot 10-15 times a day. I did try replacing a few with new but that made no difference.