Hmm . . .
As it happens, I came on the forum this morning to see if anyone else was having this exact problem.
I went for a ride the other day, mostly low-speed dirt-road travel (I'm still in the break-in period). After running perfectly for a couple of hours, I accidentally killed the engine on a steep climb out of a wash, and it would not restart - no fuel pump. Lights worked, starter worked, no fuel flow.
I suspected low voltage after so much low-RPM running, so I disconnected the headlight, let it sit for 15 minutes, and tried again. Nothing. Checked fuses; checked all the connections I could see, to no avail. Finally I called a friend. When he arrived an hour later, I tried again, and the fuel pump fired right up and so did the bike. I had him follow me back to pavement, and the bike died again. We wound up trailering it home. This morning I tried it again, with no luck. Voltage at the battery is 12.3, so that pretty much eliminates the low-voltage theory.
And if I put another gallon of gas in it, it would overflow. It's only four or five inches from the filler.
Hopefully, since this seems to be a recurring theme, someone will find a definite cause. Right now I won't ride alone, and most of the trips I have planned for the bike are solo.