Is it possible that EF units experience functionality issues when there are serverside problems, and do EF products rely on a central server that has control over our devices and can install software without permission? I'm seeking answers regarding the simultaneous malfunctioning of my product and others, which raises concerns about the extent of control and potential risks, considering that I believed my product was directly under my control through WiFi, Bluetooth, or direct connection. This seems like a serious flaw with potential health implications.