Hi Ronan,
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Your post saved me. I have been struggling with a similar problem since I received my QMX last week. My QMX's symptom is to push left rotary(change mode/band) will freeze the QMX randomly. I have given the PCB a good alcohol bath and re-done some suspicious joints, but the freeze keeps happening. Upon read your post, I opened the schematic, and found there is a very convenient location(JP302 5-7) to add the "10p" cap. I have pushed the rotary for the whole morning and proofed the remedy is right.
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Now, my QMX is ready for the trails and mountains.
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TU es 72,
Wei, AG6AQ
