Realtime spotlight is flickering

Hello everyone,

I added a spotlight to my player gameobject, to work like a flashlight. The light is a realtime light with no shadows (I tried mixed as well) and depending on the position of the player (and the rotation) the light vanishes ... especially on the floor.

I tried to increase the pixel light count in the project settings, but this didn't help. Any ideas?

https://media.giphy.com/media/Yn4NkutErcG19uU4hm/giphy.gif