hostapd: fast speed..but fast disconnect too

I have setup a hostapd server on Slackware 15
I use this adapter for server, the client also using a similar adapter

I use this configuration for hostapd

Code:interface=wlan1
bridge=br0
driver=nl80211
ssid=mysid
hw_mode=a
channel=36
ieee80211d=1
ieee80211n=1
ieee80211ac=1
wmm_enabled=1
macaddr_acl=1
accept_mac_file=/etc/hostapd/hostapd.accept
auth_algs=1
ignore_broadcast_ssid=0
wpa=2
wpa_passphrase=mysid
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP
rsn_pairwise=CCMP
country_code=IT

#HT
require_ht=1
require_vht=1
ht_capab=[MAX-AMSDU-7935][HT40+][SHORT-GI-20][SHORT-GI-40]I start hostapd and speed seems good

on server iwconfig report:

Code: wlan1 IEEE 802.11AC ESSID:"mysid" Nickname:"WIFI@RTL88X2BU"
Mode:Master Frequency:5.18 GHz Access Point: *******
Bit Rate:867 Mb/s Sensitivity:0/0
Retry:off RTS thr:off Fragment thr:off
Power Management:off
Link Quality=1/100 Signal level=1/100 Noise level=0/100
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0on client iwconfig report

Code: wlan1 IEEE 802.11AC ESSID:"mysid" Nickname:"<WIFI@REALTEK>"
Mode:Managed Frequency:5.18 GHz Access Point: *******
Bit Rate:434 Mb/s Sensitivity:0/0
Retry:off RTS thr:off Fragment thr:off
Power Management:off
Link Quality=100/100 Signal level=53/100 Noise level=0/100
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0The problem is..after two-five minutes of use the client is disconnect from AP
and it can not reconnect, I have to restart hostapd (sic!).

The kernel is 6.5.3 and this is the driver.

I have tried those solutions

a) removing ht_capab=[MAX-AMSDU-7935][HT40+][SHORT-GI-20][SHORT-GI-40]
the hostapd become slow to 173mb and the problem persist.

b) configuring the bridge using network manager or ip commands
, but is the same thing, actually I use brctl for configure it.

This is the verbose log from hostapd.