Modern Vespa

I have an issue that it randomly turns on and off tilt mechanism light. It goes as a constatnt beep and the light is red with, it happens in the middle of the ride and it doesn't allow any gas so i have to stop somewhere.

When I turn the key on and off, after 30 sec it works again normally.
And then it happens again at some point after 10km or 20km or 2 km.
It is completely random seems like.

Did to anyone happen the same and what was the issue?

Have you checked the fluid level for the tilt lock?

I did not, I would do it today. Do you think that would be the reason for this particular beep sound and behaviour.

If you've never serviced the tilt lock, then odds are the fluid (DOT4) needs to be flushed. Should be done at least every 2 years, along with the brakes (same DOT4)

Can someone tell me how to check the level of the fork oil- and or flush it? A video tutorial- or pictorial would be great.

AFAIK the front forks or "legs" are not serviceable other than straight out replacement

go to the wiki section and look up the service manual. start with that.