[Xiaomi Mi 9 Questions & Answers] seemebreakthis:
My gut feeling tells me this may not be the best place as it is really not a common problem, but I don't know where else to ask... so here goes:

My home network has two routers that are bridged together, have same SSID, and run 802.11r FT Fast Transition, so devices that support it should seamlessly retain wifi connection going from one router to the next.

The Mi9 I have however, will seemingly roam successfully, but only for a few seconds, before it apparently disconnects itself from the router, then makes a brand new connection attempt to the same router.

I use 'logcat' to dump the wpa_supplicant log during one of these incidents, as below:

09-04 20:14:06.113 2285 2285 I wpa_supplicant: wlan0: Associated with xx:xx:xx:xx:xx:xx
09-04 20:14:06.113 2285 2285 I wpa_supplicant: wlan0: CTRL-EVENT-CONNECTED - Connection to xx:xx:xx:xx:xx:xx completed [id=0 id_str=%7B%22configKey%22%3A%22%5C%22[Redacted]%5C%22-WPA_PSK%22%2C%22creatorUid%22%3A%221000%22%7D]
09-04 20:14:06.115 2285 2285 I wpa_supplicant: wlan0: CTRL-EVENT-SUBNET-STATUS-UPDATE status=0
09-04 20:14:06.123 2285 2285 I wpa_supplicant: getWifiGenerationStatusInternal: generation = 4, twtSupport = false, vhtMax8SpatialStreamsSupport = false
09-04 20:14:12.209 2285 2285 I wpa_supplicant: wlan0: CTRL-EVENT-DISCONNECTED bssid=xx:xx:xx:xx:xx:xx reason=3 locally_generated=1
09-04 20:14:12.211 2285 2285 E wpa_supplicant: eap_proxy: eap_proxy_notify_config
09-04 20:14:12.212 2285 2285 I chatty : uid=1010(wifi) /vendor/bin/hw/wpa_supplicant identical 1 line
09-04 20:14:12.212 2285 2285 E wpa_supplicant: eap_proxy: eap_proxy_notify_config
09-04 20:14:12.256 2285 2285 I wpa_supplicant: wlan0: CTRL-EVENT-REGDOM-CHANGE init=USER type=COUNTRY alpha2=HK
09-04 20:14:15.323 2285 2285 I wpa_supplicant: getCapabilitiesInternal capabilities: NONE IEEE8021X WPA-EAP WPA-PSK WPA-EAP-SUITE-B WPA-EAP-SUITE-B-192 OWE DPP FILS-SHA256 FILS-SHA384 FT-PSK
09-04 20:14:15.325 2285 2285 E wpa_supplicant: eap_proxy: eap_proxy_notify_config
09-04 20:14:15.326 2285 2285 I wpa_supplicant: wlan0: Trying to associate with SSID '[Redacted]'
09-04 20:14:15.335 2285 2285 E wpa_supplicant: eap_proxy: eap_proxy_notify_config
09-04 20:14:15.335 2285 2285 E wpa_supplicant: eap_proxy: eap_proxy_allowed_method
09-04 20:14:15.391 2285 2285 I wpa_supplicant: wlan0: Associated with xx:xx:xx:xx:xx:xx
09-04 20:14:15.391 2285 2285 I wpa_supplicant: wlan0: WPA: RX message 1 of 4-Way Handshake from xx:xx:xx:xx:xx:xx (ver=3)
09-04 20:14:15.401 2285 2285 I wpa_supplicant: wlan0: WPA: Sending EAPOL-Key 2/4
09-04 20:14:15.402 2285 2285 I wpa_supplicant: wlan0: CTRL-EVENT-SUBNET-STATUS-UPDATE status=0
09-04 20:14:15.414 2285 2285 I wpa_supplicant: wlan0: WPA: RX message 3 of 4-Way Handshake from xx:xx:xx:xx:xx:xx (ver=3)
09-04 20:14:15.414 2285 2285 I wpa_supplicant: wlan0: WPA: Sending EAPOL-Key 4/4
09-04 20:14:15.419 2285 2285 I wpa_supplicant: wlan0: WPA: Key negotiation completed with xx:xx:xx:xx:xx:xx [PTK=CCMP GTK=CCMP]
09-04 20:14:15.419 2285 2285 I wpa_supplicant: wlan0: CTRL-EVENT-CONNECTED - Connection to xx:xx:xx:xx:xx:xx completed [id=0 id_str=%7B%22configKey%22%3A%22%5C%22[Redacted]%5C%22-WPA_PSK%22%2C%22creatorUid%22%3A%221000%22%7D]
09-04 20:14:15.438 2285 2285 I wpa_supplicant: getWifiGenerationStatusInternal: generation = 4, twtSupport = false, vhtMax8SpatialStreamsSupport = false

20:14:12.209 is where the the phone suddenly decides to disconnect.

Anything I can do to perhaps pinpoint the source of the problem and hopefully fix it?

Thanks!!