Hii Everyone

here i have okuma made VMC MX-55 with U!0M control system.
i have a problem with Rotary table axis called A axis,when we run rotary axis in cycle mode, it rotate 360 degrees. But some times 1 or 2 times out of 10 it rotates and return to 358 degrees and stop without any alarm and there is no stop in auto cycle, cycle run continously.

so please help me to figure out problem i will be very thankfull to u all.