the machine has been acting up recently, plasma cut program was being interrupted and stopped due to "ess hardware velocity fifo ran out of data".  i ran most recent warp 9 smooth stepper program, deleted all irrelevant programs from control laptop.  again plasma cut program interrupted and stopped. now i cannot get access to the machine through mach4, " clearing a spurious limit hit latch event". this is first problem i have had in 2 yrs plasma cut operations?