A virus must have infected my Cat5e 1-wire cable run. I just finished a couple of hours of sleuthing to fix an intermittent circuit for a 1-wire sensor feeding a digital temp panel meter. Nothing seemed to solve the problem: connectors, a splice, the sensor, wiring block, temp meter. Then with a long jumper I checked continuity on the Cat5e cable itself, and the ground wire showed no continuity. There must be a break somewhere in the cable run for that conductor. Fortunately, I had an unused wire which became the new ground wire. It had worked without issue for about six months, then the intermittent problem popped up, and then today there was no reading at all -- had to be a mutated virus of some sort.