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Pac Man with dollar bills instead of dots.
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Nailed itPac Man with dollar bills instead of dots.



In addition to what @andrewb has already suggested, double check the solder joints on ALL header pins. You mentioned previously that you reflowed them. Reflowing means you need to remove all the old solder and reflow with fresh solder - don't just add new solder to the old, crusty oxidized solder. If a pin has been overheated, or operated long-term with an existing cold solder joint, you will need to carefully remove the oxidation from the pin itself with a small wire brush, or by scraping gently with an X-acto knife.
If you gently flex or twist the PCBs and you hear any popping and creaking, it's a telltale sign that you have oxidized pins and sockets.
You might well have a power supply issue too - so best to check that out as well - and all the PCB pins and cable-end connectors associated with the power supply cables.