Sure - the HUGE difference in wifi reliability and speed for me was some advice found on the Reddit Ubiquiti forum and the official Ubiquiti community forum. The summary is:
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turn OFF the "auto-optimize" function. This is near unanimous among Ubiquiti system administrators that this function causes WAY more problems than it can help. I had so many problems until I turned this off, mirroring what many others had posted or told me.
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Change DTIM to 3... you have to do this for each of the two radios (2.4ghz and 5ghz) and each of your SSIDs (including a guest network if you implemented one). So for me it was 4 changes... 2.4ghz main SSID, 5ghz main SSID, 2.4ghz guest network, 5ghz guest network. Easy to google DTIM and see what it's all about... and why Ubiquiti's default setting of 1 is definitely NOT ideal. Bonus - higher DTIMs will make all your mobile devices' batteries last longer... as it lowers the rate each device pings the network. I had never heard of this before my Ubiquiti setup experience...
You can read much of my learning and the community's help here:
Note that this is not a recommendation to turn off "Wifi A.I." feature... that one seems to be helpful to my network, as it automatically balances the channels of your APs based on what else each AP is seeing from neighboring networks in your area. I've left Wifi A.I. on and like to watch the changes it makes each night and the effect it has, which has generally been quite good.
The last piece of advice is to dial DOWN your transmit power of your radios for each access point. Too high and your access points interfere with each other and cause client devices to often attach to the wrong/distant access points rather than the closest ones. Unless you have a wifi analyzer app (typically Android), this takes many days of tweaking and watching the results, but the basic idea is to watch the list of clients and what APs they're currently connected to. If they're connecting to a distant AP, dial back the radio power on that AP... a bit at a time, leaving each change for a day or so to "settle in". I've got most of my radios now dialed back to a much lower power level, and the network is now super reliable to all the devices in the house. Ubiquiti defaults each AP to FULL power, which is usually way too much for a home environment with multiple APs. If you only have one AP, then ignore this advice... full power is fine. but once you have more than one, you'll find that lower power settings actually improve the network dramatically.
Hope that's helpful... happy to answer any more questions.
-josh