@Tom Jasper posted:
Very interesting. My UniFi AC Pro is located about 20 feet from MTH wifi unit but the signal must pass through a wall between the interior of the house and the garage where my layout is located. For years the system worked fine, but about 4 months ago I started to have connection problems with apple smart devices.
One thing you could try is switching wifi devices in your house off one by one until the problem goes away. I’d start with the newest devices first. If your left with just your router WIU and phone but its still not working, maybe try a new channel on the router.
Other things to try are WPA vs. WPA2, channel width (auto, 20MHz, 40MHz), and enabling/disabling 802.11b/g backward compatibility.