My render has encountered many many issues. My particle physics have fallen apart, started ignoring things like lifetime or suddenly exploding out or even just ignoring collision objects. As well as my background still flickering all the time despite having a plane fully in camera for the entire animation.
Is there anything I can do to fix this?
You are not alone on this, many people here have had problems with the rendering of this.
Please read through the other questions and answers under this video and try applying what seems to be relevant.
(If I remember correctly everyone got it working eventually...).