Hey there @dmc2008kk! Welcome to the community! Distance culling is built in to Niagara systems as a performance measure. Usually Niagara systems take the system’s current scalability into account and culls at the distances other actors are preset to. However, you can override this in the system Emitter State for the emitter you want to avoid culling.
You may also need to increase the bounds of the system so that it always has a visible and large enough bounds to be rendered.
This thread also goes over some other users experiencing the same: