TP-Link - Tried to switch one Smart Plug, Turned them ALL OFF and App Crashed

I have 7× TP-Link KP-115 Smart Plugs for various devices/appliances throughout the house. Today, I tried to switch one of them OFF from the iOS App, and all of them tripped. Also, the App became unresponsive and I had to reset the plugs all manually

Any idea what the issue is ?