Prior proscan not responding

Hello everyone,

I have a prior proscan H29XY controller. I wrote a simple program to move the stage and take a video using a camera for a fixed amount of time. The program works well but sometimes the motor simply stop responding to the program and doing anything. When this happens I'm not able to communicate with the instrument even through NI MAX, the program says the address is available but can't be accessed. These faults are random and I don't really understand what causes them. Has anyone any idea?

Thanks,

Matteo