Control freezes during sub spindle transfer problem

I am having an intermittent problem with my T32-3 control when transferring a part from the main spindle to the sub. The sub moves to the designated B position, and then the machine just stops. Both spindles are still turning, and no alarm generates, pressing cycle start or feed hold does nothing.

To fix this I press reset, and then "restart" the transfer process, and everything works fine after that. This was happening quite infrequently early this week, maybe once or twice per day, and now it is happening 10+ times per day.

Any suggestions?