I seem to be having a issue with one of my SmartThings plugs within a piston. It appears that the Power Usage will report 0 randomly even though it is being used.
I have a TV plugged into my SmartThings plug and have created a piston to close my blinds when the TV is on which works fine. I have another piston which will reopen the blinds once the TV is turned off but it will randomly reopen and then close the blinds while the TV is being watched.
A check of the history of the power usage of the plug does show usage reported randomly during usage of 0W so I adjusted the piston to reopen the blind only if the usage stayed at 0W for 120 seconds but it still keeps randomly opening the blinds.