My model seems to be loosing timesteps everytime it is restarted. Why?
The reason is that the model is hugely complicated piece of code. As such it is difficult to store the current state of the model into a file after each timestep. Instead, our client creates a snapshot of the current state every 144 timesteps (or every 15-20 mins real time). Thus, if you re-start you model/computer between the two saving periods, the model reverts to the last saved state. This is particularly visible at the beginning of each phase when you have less than 144 timesteps done; it may look as if you kept loosing timesteps. Just leave the model running for at least 20-30 mins to see.