I hooked up an elan z100 to a zantech conecting block an the keypad was recieving power for about a half an hour, Then went dead. I then replaced the power supply and the keypad was receiving power again. But then after a half hour or so it went dead again. I tried useing a SpeakerCraft conecting block and it was the same problem. I brought the keypad, conecting block, and both power supplies back to the office. When I tried the power suplies here they still didn't work. But a third power supply lasted all weekend. The block at the office didn't have any emmiters conected but I'm going to put them on now to see if that is the problem. Has anyone run into a similar problem?