Trying to understand why WiFi gets disconnected in Debian Buster

["Miguel A. Vallejo" <ea4eoz@gmail.com>]

Hello everyone. In my syslog I have some entries like this every day:

Mar  9 17:35:28 waterhole wpa_supplicant[524]:
CTRL-EVENT-CHANNEL-SWITCH freq=5540 ht_enabled=1 ch_offset=1
ch_width=80 MHz cf1=5530 cf2=0
Mar  9 17:35:28 waterhole kernel: [18873.586006] AP a0:64:8f:xx:xx:xx
tries to chanswitch to same channel, ignore
Mar  9 17:35:28 waterhole kernel: [18873.586011] AP VHT information is
invalid, disable VHT
Mar  9 17:35:28 waterhole kernel: [18873.586016] AP a0:64:8f:xx:xx:xx
changed bandwidth, new config is 5540 MHz, width 2 (5550/0 MHz)
Mar  9 17:35:28 waterhole kernel: [18873.586018] AP a0:64:8f:xx:xx:xx
changed bandwidth in a way we can't support - disconnect
Mar  9 17:35:28 waterhole kernel: [18873.586020] failed to follow AP
a0:64:8f:dc:b1:81 bandwidth change, disconnect

and every time I get a wifi disconnect, which is very annoying and
counterproductive. The only difference between entries is the "AP
a0:64:8f:xx:xx:xx tries to chanswitch to same channel, ignore" line.
Some times it appears, some times not, but all of them I got
disconnected.

I'm trying to understand the lines:

CTRL-EVENT-CHANNEL-SWITCH freq=5540 ht_enabled=1 ch_offset=1
ch_width=80 MHz cf1=5530 cf2=0

and

AP a0:64:8f:xx:xx:xx changed bandwidth, new config is 5540 MHz, width
2 (5550/0 MHz)

Because except fo the "width 2", which I'm not sure of the meaning, I
can't figure out what parameter is conflicting with my regulatory
domain to produce the disconnection.

~# iw reg get
global
country ES: DFS-ETSI
        (2400 - 2483 @ 40), (N/A, 20), (N/A)
        (5150 - 5250 @ 80), (N/A, 23), (N/A), NO-OUTDOOR, AUTO-BW
        (5250 - 5350 @ 80), (N/A, 20), (0 ms), NO-OUTDOOR, DFS, AUTO-BW
        (5470 - 5725 @ 160), (N/A, 26), (0 ms), DFS
        (5725 - 5875 @ 80), (N/A, 13), (N/A)
        (57000 - 66000 @ 2160), (N/A, 40), (N/A)

The system is a Debian Buster Desktop with a Mediatek MT7612u adapter
connected to an Askey 802.11ac access point.

Can anybody point me in the right direction? What am I missing?

Thanks in advance.