Much discussion of this issue in the forums. For the last few months, the double tap smart apps which depend on measuring the time between individual taps as received in the cloud account just don’t work reliably for most people. The cloud lag time is just too variable to allow for the precision required. In addition, there has been a problem where polling of some switches was reported as a physical event, causing the switch to turn on unexpectedly.
all in all if you need the double tap functionality, you’re probably better off choosing the Homeseer switches which use a “central scene” command set instead. With these models, it is the switch itself which counts the timing and then send command to the hub with the code indicating whether it was a single tap, double tap, or triple tap. Because only a single command is sent, there’s no lag issue as far as counting the taps.