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Possibly. It did work for almost 6 months after the upgrade, although there were weird issues the last couple weeks.

Vibration or just temperate differences since 6 months ago might have caused a connection to go bad.

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If it were a memory problem, would it work fine after a kernel flash?

If it is a memory problem then no, a kernel reflash won't fix it. A reflash will only fix it if the flash is corrupt. Can't hurt to try anyway. You can't damage anything unless you've fiddled with the flash protection pins inside.