Particles starts flowing the opposite way

I am trying to make contrails from an airplane, everything seems good, but at about from frame 720+ the contrails starts flowing both forward and backwards which is not what I want. How to fix this? I followed a tutorial and did exactly as it described, but still didnt work.

my blend file is here:

Edit: also provided a screenshot

Video of my problem. Maybe it’s easier now for people to see what I am talking about.

Is there really no one here that knows what can be wrong? =/

Hi,I think your choice of third party file sharing might be the problem.
Try this one: WeTransfer,

Why? It is so easy to download from that page. WeTransfer, you can only send to an email.

you need to bake the particle system caches before rendering, especially since you’re using motion blur in your render. this will resolve your issue. enjoy!