well im running mach2 and small parts turn out great but for some resone if the file is big and runs for say 45 minutes it will ussaly skip steps and get off,its not mechanical problem, i did catch it in the act the motors where just twitching and i grabed the shaft and could spin them as if there was no power.and then bam ther where moving again off line for say 3 sec,so i thought power supply? it was a 24v switching type i pulled it out and hooked up 2 12v batterys to make 24v and what a difrance before the motors wher loud and and choppy. now they run cooler and no noise and smooth?? its even at higher volts24v vs 21v?? so i thought that was def the problem i ran a fairly larg file and it got of again??so it didnt fix it??even thought it fixed other problems, any help pls