Studio Spot 250 Issues

Out of the 8 that I have 1 of them has been giving me alot of grief the last few weeks... some days it runs great.. other days I'll be in the process of aiming and what not then it will start randomly moving in all directions, run thru random gobos and colors, and the shutter will open and close.. then it will just stop and start working correctly on its own.. kind of embarrassing when im in the middle of a show.. any help will be much appreciated!!
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