LB-15 OSP5000L Axis pause during operation

[KMWPAT]

Hi, I have a mid 80's LB15 during auto operation the axis will pause for a couple seconds up to 30 sec then take off. No distance to go on the screen the spindle shows its up to speed. It s acting like single block is on but if i hit cycle start it still don't move until it wants to.
this happens at different places in the program very random. the control is showing that it is in position RAPA= RCON. (I think that's correct)

Has anyone else had this problem? any ideas?

Thanks,

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[OkumaWiz]

Check your status lights. Run is most likely lit. Is the STM light on? If you go to block data, is anything blinking?