I wish I had your luck. I have the dubious pleasure of working at an MSP who support literally hundreds of companies with Unifi stuff installed. We see issue such as overheating on different customers or speeds suddenly drop to ssid suddenly disappearing.
I work part-time for a high-end domestic installer and they’ve literally got thousands of UniFi access points in use all over the UK, Ireland and a few in Europe and they’re rock-solid. I have massive issues with other UniFi equipment (the routing and controlling mainly) but the access points are bullet-proof.