Xiaomi Smart Bluetooth Socket is not available in Version 2021.4

I try to add Xiaomi Smart Bluetooth socket via Xiaomi Miio in home assistant , the model is chuangmi.plug.hmi208, it can be connected successfully, but it always disconnects automatically and cannot be found. After some time, it connects again automatically. anyone know how to solve it? thanks

home assistant is installed inside the Synology NAS

Log


Logger: homeassistant.components.xiaomi_miio.switch
Source: components/xiaomi_miio/switch.py:565
Integration: xiaomi_miio (documentation, issues)
First occurred: 下午4:31:59 (5 occurrences)
Last logged: 下午4:40:59

Got exception while fetching the state: Unable to discover the device 192.168.2.155