For the last 3 years I have noticed periodic messages in the ELK M1G log indicating ‘Transmitter Supervision Loss’ with a particular ELK-6030 PIR motion sensor. I have repeatedly checked the sensor and s well as replaced the battery and found the sensor to be operating properly. The system has two ELK M1XRFTW receivers installed and the particular PIR motion sensor is located where it is likely to be received by both receivers. I have attributed the log message to an issue with signal reception and reliability in multi-transceiver applications for the older ELK M1XRFTW receivers I have. Recently while checking the firmware on my devices I noticed there is newer firmware available for the ELK M1XRFTW. I had installed version 1.2.50 and decided to update them to 1.2.56. I am wondering if this may solve the issue with the repeated log messages on the system? I do not feel it is cost effective to buy newer ELK M1XRFTWM receivers for the system at this time.