I am really desperate now.
Wrote two support tickets - first at 8th march from our corporate e-mail server, but after not getting answer for weeks, thought that maybe our advanced gray-listening system blocked answer message, so sent another mail from gmail - same thing. No answer from support team.
Ticket#2018030822003493 - 8th mar. - no answer.
Ticket#2018032222004947 - second one from gmail.

This was to mikrotik, now - problem.
Will copy-paste support ticket message without configuration, hoping that our mighty community might help! Еhank you very much in advance!

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Hi!

Our company deployed CCR1009-7G-1C-1S+ and about ~40 wAP AC with CAPsMAN at one of our customer property in Kazakhstan and now we are facing some problems. This is my second time working with CAPsMAN and large WiFi network, first was few years ago at Banku Augstkola in Latvia and I do not remember this problem persisted back in those days.

So, my problem:
1. Apple devices such as iPhone or iPad after switching display off while it is connected to any of (virtualAP) WiFi networks loses signal just after 5-30 seconds. But when you wake up device - WiFi connection creates again.
My testing was simple - pinging iPhone from CCR, switching off display, after 5-30 seconds - pings timeouts.
2. Android devices sometimes looses connection too, but devices stays online more than Apple devices, while in sleep for sure.
3. Roaming while in sleep - as far as I can tell, when device is connected to the one AP - all can be fine, but when you start roaming - device not re-connects to other APs with the same SSID. This is more for Android devices, because iOS devices disconnects very fast in the first place.
4. On the other hand - I tested - iPhone (6s in my test case, with latest iOS), my Android device (LG G5) or my DELL notebook - while NOT in sleep mode - roams flawlessly - I walked all over the place and monitored all devices in CAPsMAN->Registration Table and all of the devices beautiful roams and reconnects between access points very fast.
Problem is only with mobile devices and in sleep mode. More with Apple, less with others.

After some digging on the Internet, I tried to add in CAPsMAN:
- Keepalive frames enabled
- Country - US
- Disconnect timeout - 1h
- Disabled RSTP/STP on bridges
- Added longer DHCP lease time - 12h
- Started playing with access list - right now APs drops signal on -83dBm,
but it creates some other problems with devices trying to reconnect to same AP while under bad signal.

And some other playing with configuration I not remember anymore.
Any of this not helped.

As far I know - this is something to do with mobile device power management and how AP is configured. Some said, that it can be eliminated simply disabling all of VirtualAPs and leaving only master configuration. Sadly, I cannot do that in my enviroment, our customer needs those VirtualAPs.
Deeper digging suggested, that I need to enable WMM, but I found no option for that in CAPsMAN. Only mentioning at mikrotik forum, that WMM is enabled by default in CAPsMAN.

APs is configured simple - enabled CAPs mode (holding MODE button at startup) on wAP AC and added admin password.

Thanks for help.

Does disabling WiFi Assist in Settings, Cellular make any difference?

try use 20Mhz ( only ).

i have same issue before, i change the channel widht to 20Mhz and problem solved.

I added multicast-helper=full to CapsMan Configuration for the iPhone problem.

This may help prior to configuring your devices as cap enabled

/interface wireless
set [ find default-name=wlan1 ] country="united kingdom" frequency-mode=regulatory-domain mode=ap-bridge ssid=MikroTik

Change the country

The auto channel frequency did not work for me - I used the following lists.

/caps-man channel
add band=2ghz-b/g/n control-channel-width=20mhz extension-channel=disabled frequency=2412 name=capsman-channel-list-2GHz-Ch1
add band=2ghz-b/g/n control-channel-width=20mhz extension-channel=disabled frequency=2437 name=capsman-channel-list-2GHz-Ch6
add band=2ghz-b/g/n control-channel-width=20mhz extension-channel=disabled frequency=2462 name=capsman-channel-list-2GHz-Ch11

Use create-enabled in provisioning - you can then specify the channel in the master cap interface - not the slaves.

I used a local expert for these solutions - it took him 40 mins to resolve my problems which I had been looking at off and on for over 40 hours.

MikroTik tech support did not supply the solution.

Does disabling WiFi Assist in Settings, Cellular make any difference?

I think I was trying that, will re-check. Thanks.

try use 20Mhz ( only ).

i have same issue before, i change the channel widht to 20Mhz and problem solved.

I have 20Mhz on 2.4 (Extension disabled) and 5Ghz (Extension Ce). Thanks, will try to play with this config too.

I added multicast-helper=full to CapsMan Configuration for the iPhone problem.

This may help prior to configuring your devices as cap enabled

/interface wireless
set [ find default-name=wlan1 ] country="united kingdom" frequency-mode=regulatory-domain mode=ap-bridge ssid=MikroTik

Change the country

The auto channel frequency did not work for me - I used the following lists.

/caps-man channel
add band=2ghz-b/g/n control-channel-width=20mhz extension-channel=disabled frequency=2412 name=capsman-channel-list-2GHz-Ch1
add band=2ghz-b/g/n control-channel-width=20mhz extension-channel=disabled frequency=2437 name=capsman-channel-list-2GHz-Ch6
add band=2ghz-b/g/n control-channel-width=20mhz extension-channel=disabled frequency=2462 name=capsman-channel-list-2GHz-Ch11

Use create-enabled in provisioning - you can then specify the channel in the master cap interface - not the slaves.

I used a local expert for these solutions - it took him 40 mins to resolve my problems which I had been looking at off and on for over 40 hours.

MikroTik tech support did not supply the solution.

Will try multicast helper.
Do you mean that I need to change /interface wireless on every CAP device?
Right now channels is created by CAPsMAN itself, I left these parameters blank. And from that perspective - CAPsMAN doing just fine. When I was testing - channels overlapped only slightly. on 2.4G network..
Thanks.

Did you solved your problems?