Camera doesn't render particles correctly at certain angles.

So... I was trying to make some cool visual fx for my game, but the particle system is not quite working... For me, at least.

So, here's the deal:

Some particle systems in my scene work correctly, and others don't. Whenever I move my camera to some specific angles, the particles simply disappear (most of the gameplay was based in those angles...). I have no idea on what's going on... Is it because I'm using Unity 2018.1b?

Also, the problem disappears once I activate the Trails...

Thanks...

Camera doesn't render particles correctly at certain angles.