When the helicopter is patrolling the map I have a lag on the server. Does anyone know why this is happening?
It only happens when the helicopter event happens. 

For that I had to shut down the server with the command:
heli.lifetimeMinutes 0

EDIT:
When is lag on the server I checked the RAM and CPU and everything is within range. So I don't have a problem with Ram and CPU at that moment.