Google Analytics Network De-Activates

Every so often, this plugin, which has been installed, and Network Activated, so that each MU site is being tracked, deactivates itself, so that no data is being tracked.

For example, it turned itself off around Jan 25th, and then I turned it back on around Jan 30th. It has now turned off again today, Feb 3rd.

Why is this happening, and how do I make it stop?

Thanks.