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I haven't used the device, but I am a computer engineer and work with similar stuff regularly. Checking your connections is a good start, but remember that a hairline fracture in a solder joint may only show up in real-world usage. I would recommend touching up all the solder to see if that solves your issue. Successful flashing means that the firmware is there and good. I assume you've done "verify" to make sure it is there and good.
A sometimes-good test for solder cracks is to power up the board and twist it back and forth to see if it duplicates the original issue. If so, solder it all up and you should be good.
good luck.
I ought to build me one of these. They work on OBD1 cars, eh?
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