Spotlight gives flash when in contact with fog particle

Hey all,

I’m currently strugling with an animated aircraft with a searchlight underneath it. Everything seems to work well, exept that when the spotlight hits a fog particle, it gives of a quick flash. I’ve added a video with an animation quicky showing the issue.
It’s not the beam of light, it’s the flashes of light you see here and there next of the aircraft.

bumpty dumpty

sat on a wall

bumpty dumpty had a great fall

All the king’s horses and all the king’s men

Couldn’t put Bumpty together again.

(deadline is here, haven’t been able to fix it so it :confused: Answeres are still welcome for future people meeting this problem)