I'm just as confused. 
There is nothing in that driver that would make it turn on/off without an app, you, or something else acting on it. If you try disabling the device in Hubitat, that would be one way to make sure the problem isn't coming from outside (this will stop the device from participating in any automation: all apps, including rules and your IFTTT integration). If it still happens, then something on IFTTT, SmartLife, or something else would have to be doing this.
I'm sure you know how to find possibilities on the Hubitat side, but if not, the "In use by" section on the device page would be a good starting point--check app the apps it's in use by. I'm not as familiar with how to do this on IFTTT or SmartLife, but it sounds like you may have already checked the former. One of these things might help narrow it down, at least.
