My answer is this
1. Xiaomi TV is always disconnected because your Internet connection is unstable.
2. If your TV router is too far away, and the router's signal can not cover the TV, or intermittently in the edge of the coverage signal, then your TV will be disconnected, the correct solution is to put the router slightly closer to the TV. Get the signal all over the TV, so your TV doesn't always go out of service.