A while back I too lost communication with my PLM. I tried unplugging the PLM, 994i and restarting in the proper order. Nothing worked. All indications were that it was dead. Of course programs didn't work since the PLM seemed to have failed. A day later, without making any changes, everything returned to normal. Notice the sigh of relief. I did post the problem and learned that it's possible for the PLM to be influenced by noise on the circuit. The most likely culprits being transformers / power supplies. I don't know why this should be a problem since nothing has changed in the last few months. Since it started working on its own I made no changes. Two days ago the PLM "died" again. I went through the same routine of powering down / up without success. I have a long power strip in my basement that supplies power to the ISY, PLM, telephone and a couple external hard drives. I removed everything from the power strip except the ISY and PLM and am happy to report no further problems. My guess is that one of my power supplies is getting noisy creating the problems.
