After the new Andorid 9 update of 625 mb, mibox3 wifi becomes unstable.

[abhushansahu]

It frequently disconnects from connected wifi source, and mobile hotspot source, even when the connection is actively using the internet.

[exkc]

@abhushansahu

U can drowngrade Android 9 to 8.

here is how https://wiki.postmarketos.org/wiki/Xiaomi_Mi_box_3_(xiaomi-once)