I have the following odd situations:

1. The Netro does not show any watering activity.

2. My watering system is turning on by itself, and one of my zones is just firing away, spreading water for hours on end.

3. The Netro does not seem to be be able to stop it or even show that it's running.

4. Unplugging the Netro did fix the problem. Even more bizarre

I have an old Netro that never did this. I wonder if I should just swap them out?  This newest one seems to bug sometimes?

Any thoughts what could be doing this?