+1

It does sound like the early stages of regulator/rectifier problem, plug terminals are on there way out, but not quite lost all contact, which explains why its a bit intermittent. Is the engine trouble light flashing any code at you with ignition on/engine not running? I'd pull off the reg/rec multiplug and have a look inside at the terminals, if there is any sign of scorching, blackening or melting then you've found your problem. First fault like this I've heard on a 2011 bike, usually the early ones are affected? The bonus is your bike is well within warranty and this fault is a warranty issue, you shouldn't have any trouble extracting a new wiring loom from Yamaha. Surprised your dealer didn't investigate this first up?

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