ML Flatlined

So, I was watching the progress on tensor flow for a day or two and the progress kinda flatlined and went erratic around 80M

I tried the .NN file and it was basically useless.

I know the training is working fine as I periodically stop and test the NN file, no issues, however, not sure why it did this… and can I go back to a better result?

Is this a typical issue if the ML decides to go bonkers after training so long?

It would be nice to save the NN file based on the highest degree of reward or other factors as it trains…

This is an old post, but the basic method still works with current ml-agents:
https://github.com/Unity-Technologies/ml-agents/issues/1047#issuecomment-409660869