Unity 2019.3 LWRP strange Performance Issue on android

I am trying to create my next mobile game but I am simply not able to fix the fps issues with the game. It just jumps from constant 60 to 50 and then it stays at 50. I am not doing absolutely nothing it the game while this happens. Just standing and giving some basic input (there are no effects introduced or new elements).

The main issue is that my CPU is waiting on GPU, at least from what I understood. This is expressed with Gfx.WaitForPresentOnGfxThread. But when I open the profiler to see what it is going on I only see a green bar in the render thread without any kind of name or specification. I am not really sure what this means and I can fix it.

I have disabled multithreaded rending in the player settings and also enabled graphics jobs.

Does anyone knows how to fix this or what the issue is?