niagara systems animation stuck or only partial

i noticed something weird in UE5.2 with niagara systems.

some fx only play partially when i open a map. by partially i mean that some calculations in the niagara emitter seem to be skipped. for example the size and look of particle sis ok but the position is frozen. this also happens often when i change vlaues in the blueprints holding the niagara fx. the only way to fix it is to change values until it works again or to move the actor in the map.

somebody knows whats the cause? this did not happen in ue5.0. i just updated to 5.2 because the niagara systems kept crashing due to the use of audio spectrum.