Ensure you do not have the TPL-407E/E2K units connected to surge protectors or to any outlet with appliances.   Please also ensure the units are connected to outlets within the same circuit breaker box.  Reset the units and ensure they are configured with the same Network ID or use the sync button to connect them together.

It is not recommended to use this product on electrical systems that use AFCI circuit breakers or plugged into GFI protected outlets as this may cause performance degradation or loss in connectivity.