I am having trouble with my X axis (single motor) losing home (0,0). I set the torch tip at the corner of my plate, zero the x and y and then it cuts my array of parts just fine. After the last cut it travels back to the home position (0,0) but instead of being in the same place it has now gone about 1/4" to 3/8" off the plate on the x axis only, the y axis (dual motors) is fine. The plate didnt move and the set screw on the gear is tight. It recently started happening the last 2 or 3 times I have used the machine and I havent changed anything on the computer, control box or table. I havent heard any wierd noises and the torch has not crashed anything. I have been cutting all 1/4" plate. Any ideas?