Buddy

I use Honda angle sensor

It’s saying my shift buttons but I checked them their dry, and look phenomenal, I’ve seen many things about a battery but I’m not sure

The Shift clutch is on the motor where you pop the nut loose and go counter clockwise until resistance the 1/4 turn clockwise right? and as far and any error code my N is flashing twice which I’m pretty sure I seen that as the shift buttons

I have a 2007 Honda foreman 500 es and when it’s not running it’ll shift into first and N, but as soon as I start it and let it idle about five minutes my N flashes and I don’t understand what’s wrong, I’ve replaced shift motor, and got 2 shift angle sensors, I’ve seen things about batteries and I’m just lost, any help