Yeah so sometimes, especially when clutchless shifting, my 06 500f shifts itself back into neutral from 2nd, and rarely into "neutral" from 5th (I think).

Someone know whats up/what I can do to fix it?

I had a different issue of 'missing'  neutral from either second or first when I wanted the neutral half click.  I resolved it by changing my oil to the expensive Suzuki motorcycle brand.  If you've recently changed your oil brand, it can have shifting/transmission effects.

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Clutchup210, use the clutch and work on making full positive shifts, it's falling back out of 2nd because you're not getting it fully engaged. There's a false neutral between 4th and 5th so it can slip back there too if not fully engaged.

PantheraLeo, for some unknown to me reason the GS tranny can be difficult to shift into neutral when oil is overfull and hot and bike is stopped.  It wants to slip right by neutral when shifting either up or down.  When oil level drops it stops doing it.  There was a thread some time ago with a number of members reporting it and I have experienced it myself.

I've read the shifting into neutral difficulty is common when the oil is overfilled, even on other bikes. Last time I did an oil change, a number of things happened and I unknowingly put in about a gallon of oil. Wouldn't shift at all when stopped. Drained it out to the specified 3 quarts/liters and everything was solid.

Quote from: gsJack on November 15, 2014, 08:45:59 PM
Clutchup210, use the clutch and work on making full positive shifts, it's falling back out of 2nd because you're not getting it fully engaged. There's a false neutral between 4th and 5th so it can slip back there too if not fully engaged.

PantheraLeo, for some unknown to me reason the GS tranny can be difficult to shift into neutral when oil is overfull and hot and bike is stopped.  It wants to slip right by neutral when shifting either up or down.  When oil level drops it stops doing it.  There was a thread some time ago with a number of members reporting it and I have experienced it myself.

Yup, mainly an oil problem, quality or quantity is yours to decide, and also what gsJack says.
With "old" crappy (read: Motul 5100 within 2k km's of putting it in) oil my tranny was full of false neutrals.
Nowadays I rarely find one, and that's when I know I got lazy and shifting wasn't "positive" enough (Mobil Delvac MX 15w-40, almost 3k km's on this fill). Oh, and one doesn't clutchless shift a GS500 between 1st and 2nd
Try getting the oil level exactly halfways between the "full" and "low" marks, and don't baby that shift lever.