Hi, I have several eMG80 systems installed with various models of phone sets, LDP-9030, LDP-7024, and LDP-9224DF. The issue is random erratic lights on the keys. I have installed choke coils on the station lines and on the KSU's power cable and I have installed a OneAc Power Conditioner, no luck. Also, I have the KSU's grounded. Out of the 20 or so systems, I find this problem on 4 of my installs. It doesn't matter what model phone set I'm using or what firmware I am running on the KSU. Thanks in advance for your help.