WAC124 Disconnected when Sync with NTP Server - SECOND :D

Hi All and thank you four you answers...

I'll try to answer everybody with a single post 😄

DaneA  That test you request would be hard to do, for 2 main reasons:

1) even if I place the AP directly connected to the router (either in AP or Router mode), I'll miss the HA monitoring. Unluckly the raspberry server where home assistant runs, in impossible to move due to logistical reason and funcional reason (that move us to the point

2). Loosing the monitoring, I can't check in real time the disconnection. I should watch the whole day the WAC124 logs in realtime to check when it starts the NTP Sync and than try to use a Domotical Device (such a plug) to check if it work.  2) Unluckly all my house is full managed by domotical devices... light, plugs, the hot water heater... I don't have a precise timable when WAC124 starts the NTP Sync... apparently is totally randomic. So i Should stay in constant monitoring (as I described above) the whole day and in the meanwhile the whole house would be completely stopped. 

Only thing I can do is to switch the 2 AP, configuring the TPLINK to act as WAC124 and then, move the wac124 in the position you described. But the monitoring issue still stand up.  I trought many time to to that test... but... honestly, even if it will work (and I have doubts), the AP became useless for me. Basically because of the sync of NTP server...  I promise, when I'll have time, to try to do that test, unluckly not in shot terms...  Thinking about that (but is just based on my thought, nothing tangible ‌‌) should not change anything. 

schumaku  about the VLAN... of course the WAC124 do not support the 802.1q standard... in fact the vlan is not set up on the AP, by basically only on Router/Firewall and the switch. Should be totally transparent for the AP. No VLAN set up is available on the AP settings (that's completely correct). The VLAN tag start when the packet pass trought the switch port and then is managed by the switch and the router (that tag and Untag the packets depending where goes, ingoing or outgoing)... in fact all the traffic runs perfectly between the devices... in the WAC124 diagnostics no CRC... the streaming trought the wifi connection (when used, as an example for GUEST SSID) do not suffer any disconnection. The other 2 devices linked at the same switch allways in switchport vlan 10 (the Ezviz camera and the philips Hue Hub) do not suffer any disconnections even when the NTP is in sync.  As an example... it happens sometimes that I ask "Alexa" to "turn on this plug...".

Using the Echoshow, I noticed the yellow line in the lower part of the screen that means "no connection". If in the same time I use the Philips HUE app on my phone, I'm perfectly be able to turn on and off the lights. In the same time, the plugs do not work. That's because the plugs, share with the AP the Wifi connection and the philips hue use a Zigbee to talk with the bulbs. So the overall internet connection works, even on VLAN10... and in addiction... When I notice the disconnection, if I try to ping the plugs, or the shelly, in the intranet they're perfectly reachable. In fat on the AP only "WAN" led is shut off...

Please excuse me if I was, in some way, inaccurate for the VLAN theme.

Cookie53  sad to know that you also suffer the same issue. Did you check the disconnection of your wifi device with certain when the AP start to Sync with NTP server?

Hope this notes help you all (and me as well) for diagnostics.