Why is this happening? Which plugin might this conflict with? Every two seconds it switches from day to night, and after a couple of minutes it stops working altogether.
Switches from day to night
Any plugins that modify the weather can cause conflicts. A couple that come to mind are PreferredEnvironment and ZoneManagerTime. Unfortunately this isn't a straight forward fix as each plugin is trying to control the time and weather with their own set of conditions without communicating with each other.