To reproduce:
1. Import attached package
2. Open "TestScene". It contains a few particle systems under a parent particle system and a script for enabling/disabling the system.
3. Enter play mode - wait for the particle system to disable itself and them press "Activate Particle Again"
4. Notice how the duration of the effect is considerably shorter (except for one particle system which is has it's simulation space set to world)
5. Go through the three child particle systems and disable prewarm. Press the button again - everything works fine

Note: this seems to affect only local simulation space particles

Does not occur with version 4.2.2f1