Fibre optics turning UFO light stops turning

My fibre optics turning UFO light stops turning either might be something inside on the plate it turns on which I haven't thought was the issue but could be. Or it's the weight on the strands being heavier on one side after sitting in a box that is got misshapen in (heavier to the side that laid flat on the bottom of the box). I've looked up information that it should become more malleable with heat but I'm scared of ruining the strands. Any advice would be much appreciated