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The fact that the volume display freezes tells me it is something with the headunit. If your radio has some sort of factory reset, I would try that first. The software may be glitchy. Beyond that, pay attention to when this problem happens and look for patterns. I'd pay attention to things like turn signals, door locks, and any of the "car things" that the headunit controls. If there was an issue on the data line, that could make your radio screwy I suppose. None of your audio wiring (amp, speakers) is going to cause the display to freeze, so you can eliminate all of that stuff.
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