Symptoms are similar to an old battery that doesn't have sufficient current capacity anymore. Just like what happened with my VFR800.
Or there's a bad/corroded connection that doesn't allow sufficient current flow.
In other words, the battery doesn't have the capacity to provide starting current while maintaining 12V for the electrical/electronic components.
On my VFR800, if I measure across the battery posts, I got 13V. But when I pressed the starter button, it dropped to less than 4V.
I replaced the battery, and everything works fine.