I have a Mics 7.1 with copper trunks only one month old. Customer says they are on the phone (T-7316e) the display goes out, call drops, display comes back on immediately but call is gone. This is not a restart where phones flash. Display comes back and line buttons that were in use come back almost immediately and they can make another call. this does seem to happen after several minutes of being on the phone. Has happened to at least 3 separate extensions. all new Avaya T-7316e phones.