Hi guys.

I have problems with office users connecting to 751G-2HnD acting as access point.
Some of them get randomly disconnected and have to reconnect manually to use it again.
So far it was reported from users using Macs and Dells (although it is stable on my Macbook Pro)
I think both have Broadcom based cards.
There are no spikes in resources usage (CPU, Memory) either.
The version of RouterOS is 5.20.

Flags: X - disabled, R - running
0 R name="wlan1" mtu=1500 mac-address=XX:XX:XX:XX:XX:XX arp=enabled disable-running-check=no
interface-type=Atheros 11N radio-name="XXXXXXXXXXXX" mode=ap-bridge ssid="XXXXXXXX" area=""
frequency-mode=manual-txpower country=norway antenna-gain=0 frequency=2437 band=2ghz-b/g/n
channel-width=20/40mhz-ht-above scan-list=default wireless-protocol=802.11 rate-set=default
supported-rates-b=1Mbps,2Mbps,5.5Mbps,11Mbps
supported-rates-a/g=6Mbps,9Mbps,12Mbps,18Mbps,24Mbps,36Mbps,48Mbps,54Mbps basic-rates-b=1Mbps
basic-rates-a/g=6Mbps max-station-count=2007 distance=indoors tx-power-mode=default
noise-floor-threshold=default nv2-noise-floor-offset=default periodic-calibration=default
periodic-calibration-interval=60 dfs-mode=none antenna-mode=ant-a wds-mode=disabled wds-default-bridge=none
wds-default-cost=100 wds-cost-range=50-150 wds-ignore-ssid=no update-stats-interval=disabled
bridge-mode=enabled default-authentication=yes default-forwarding=yes default-ap-tx-limit=0
default-client-tx-limit=0 proprietary-extensions=post-2.9.25 wmm-support=disabled hide-ssid=no
security-profile=crypto disconnect-timeout=3s on-fail-retry-time=100ms preamble-mode=long compression=no
allow-sharedkey=no station-bridge-clone-mac=00:00:00:00:00:00 ht-ampdu-priorities=0 ht-guard-interval=any
ht-supported-mcs=mcs-0,mcs-1,mcs-2,mcs-3,mcs-4,mcs-5,mcs-6,mcs-7,mcs-8,mcs-9,mcs-10,mcs-11,mcs-12,mcs-13,mcs-
14,mcs-15,mcs-16,mcs-17,mcs-18,mcs-19,mcs-20,mcs-21,mcs-22,mcs-23
ht-basic-mcs=mcs-0,mcs-1,mcs-2,mcs-3,mcs-4,mcs-5,mcs-6,mcs-7 ht-txchains=0,1 ht-rxchains=0,1
ht-amsdu-limit=8192 ht-amsdu-threshold=8192 tdma-period-size=2 nv2-queue-count=2 nv2-qos=default
nv2-cell-radius=30 nv2-security=disabled nv2-preshared-key="" hw-retries=7 frame-lifetime=0
adaptive-noise-immunity=ap-and-client-mode hw-fragmentation-threshold=disabled hw-protection-mode=none
hw-protection-threshold=0 frequency-offset=0 rate-selection=advanced multicast-helper=default

This is the security profile I'm using:

1 name="crypto" mode=dynamic-keys authentication-types=wpa2-psk unicast-ciphers=aes-ccm group-ciphers=aes-ccm
wpa-pre-shared-key="" wpa2-pre-shared-key="XXXYYYZZZXXXYYYZZZ" supplicant-identity="MikroTik" eap-methods=""
tls-mode=no-certificates tls-certificate=none static-algo-0=none static-key-0="" static-algo-1=none
static-key-1="" static-algo-2=none static-key-2="" static-algo-3=none static-key-3=""
static-transmit-key=key-0 static-sta-private-algo=none static-sta-private-key="" radius-mac-authentication=no
radius-mac-accounting=no radius-eap-accounting=no interim-update=0s radius-mac-format=XX:XX:XX:XX:XX:XX
radius-mac-mode=as-username radius-mac-caching=disabled group-key-update=5m management-protection=disabled
management-protection-key=""

This is my routerboard:
routerboard: yes
model: 751G-2HnD
serial-number: XXYYZZXXYYZZ
current-firmware: 2.38
upgrade-firmware: 2.41


P.S
We have 3 751G-2HnD access points, with the same SSID and different frequencies in the office.

Hello all,
I have wireless problem too - HW is RB751U-2HnD, ROS version 5.20.
Broadcom based wireless card in my Dell E6420 - the connection is unusable, ping to RB751 is between 1-3s, no interference. Maybe it can be a ROS bug, or settings, will try to solve it today. Any other wireless devices are OK (HTC phones, Lenovo netbook).

I think that both problems (YazzY's and mine) can be linked together - any suggestions?

Thank you & best regards,
malda