Ethernet Trouble can be caused if the M1XEP is unplugged from the M1 OR if the M1XEP is set to Supervise the connection to the Central Station Receiver and the communication is lost. Under the M1XEP Setup, Central Station Tab is “Supervise the Connection” checked and if so what is the Heartbeat Interval? You may need to increase the Heartbeat Interval higher. If you remove the M1XEP perform the Bus Module Enrollment and you will need to Disable the Phone Number reporting to Central Station.