I have 2 deployed in my house and have 0 disconnect issues.
One is legacy with RGB, the other a newer version with just blue LED.
But then again im running a UDMPro as well, with handoff's, so i do not know if its just handing off to each other when it disconnects.
Care to explain exactly what you do that causes disconnects?
The UAP6 LR's are fast as hell when paired with AX210E chip client side.
Are you running a dedicated Unfi OS device like a cloud key? or even a RPi moded cloud key?
Ouch... that must suck especially at how difficult it is to get one of them.
Is it a legacy version with RGB or a Post production version with just Blue LED?
I would suggest you try to run a dedicated Unifi OS console. They can be run on almost anything from a FreeNAS 11 server, to a Raspberry Pi.
You really need a dedicated Unifi OS console with unifi products, as i have noticed without one running in the background 24/7 they sometimes act "funny".
All i can say is OUCH when consumer gear costs as much as enterprise gear like ASUS does. :X
And going down your list, those are some pretty expensive ASUS gear you have there...
I honestly think tho, that the Zyxel AP's listed above are probably higher tier then ASUS is.
I am also full in on Unifi gear... i am a sucker for OLED screens especially on enterprise grade gear... but OLED > RGB!
If you have the Unifi Backbone already in place, Unifi Gear is definitely better then Zyxel... i have a a 48 port Zyxel switch where u just see the top of it in that picture above.
But having a Unifi Backbone, makes unifi products very stupid easy. Like setting up VLAN, setting up secondary DHCP, setting up IoT for your smart switches so they don't use up the same 192.168.x.x network as the rest of your PC's in that network and such.
For example.. all my switchs are on its own IoT network on a separate VLAN as my PC's and NAS, so by if some chance my smart switch decides to get hacked, it can only report other switches on its network.
But again, this is only if you have the backbone already setup for a unifi network, otherwise i second tech junky's advice on the Zyxel.
Zyxel makes really nice stuff for its price. I would definitely rank them even above TPLink and possibly equaling out with Mikrotik.
eNGenius also makes really nice stuff as well. I have worked with eNGenius products before, and was really happy with them.