Machine just started inadvertently routing at the wrong depth.I home the machine and plow the top and bottom of a wall end for a cabinet. the route starts at a certain depth. Not necessarily the depth on the program. if the program says .25" in Z, it may start at 0.125" the farther it goes, the deeper it goes. when it lifts and moved down to the other end of the panel. it will be @ .10" deeper at the end of the second route than at the beginning of the 1st route.Reset the machine and it repeats the process again. may start at @ .180" deep this time. It zeros itself without error. was thinking encoder, just not sure