I have not seen that "Data input appears to have stopped" in my Cumulus1 install but do get it regularly in my CumulusMX which uses the WiFiLogger IP. In this case it is due to the CumulusMX disconnect to allow WiFiLogger to do its own periodic uploads, and it then continues fine after the disconnect period.
I can't likely help on your Cumulus1 issue but checking your logger connection would be a first thing.
I suggest you zip the Diags folder that covers the period of that message and post on the Cumulus forum.
Enjoy,
Paul