Leicina Special Repair / Question

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I recently got my hands on a Leicinia Special from a relative. The camera had been sitting for a long time, and after fighting for a while, I was able to replace the battery and get the camera shooting again. After about 5 minutes of flawless operation, the camera stopped working for me. I'm not sure if it's a combination of buttons I hit or what, but now, when powered on and the trigger pushed, the camera only makes a light mechanical thunk sound as if the motor is trying to run but can't. I can get the camera to make a "brrr" sound for a few seconds when it gets moved around a bit, but it's very inconsistent. Has anyone else had this problem, or know of common solutions that might fix it? The battery indicator is showing a good battery, but nothing else seems to work. PLEASE HELP!