I Have a customer with a ipoffice,basic mode. The lines are coming from a fiber provider thru their modem and they output analog lines. At least twice a week all the lines on the ip office go red and the lines appear to be dead, if you reset the system they come back. If you put a butt set on the lines they are fine. Is the system getting something from the providers modem that is causing the lines to get "tied up"?