if you see disconnects on the plug, try firmware upgrade first. http://static.tp-link.com/iotUpgradeTool_V1.0.zip Make sure plug can receive good signal from the router. You can check the signal...

any update?

no heard of a problem about that, but plug won't control unit with layer-two switch.

do you have a cloud account? make sure you do. Then try a firmware upgrade. http://static.tp-link.com/iotUpgradeTool_V1.0.zip if that doesn't work, make sure your router firewall is off and open port...

It is 12V/1A for the power adapter output, so you can look one with same standards online or electrical equipment stores.

nope, a device can only be binded to one account. But you can use other phone which are in the same wifi network to control it locally using the app.