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I'd say you've had a dodgy connection at the USB plug. It's sat round for 5 months exposed to good ol' air and oxidised slightly. A few insert\remove actions has scraped it clean and you have broken the surface coat resistance.
We use a stuff called De-Oxit on network cable connections for the same reason. Voltage is low, Current is low, doesn't take too much resistance to reduce delivery of both or either and you have comms problems. USB connectors are similar and not very robust.
A tiny wipe of CRC\WD40 on the wire fingers in the plug and on the cable end will keep them clean of film corrosion.
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