My ubiquiti UAP-Lite was great, until it became flakey. I swapped it for an ancient router that supported an old build of ddwrt, and everything wireless started working again.
Retrospectively I think the ubiquiti AP’s flakiness was caused by a firmware update. This Reddit post is ~2 years old:
I’ve been meaning to do a hard reset and/or change the firmware, and put the ubiquiti AP back into service, but the old & slow ddwrt router works fine for everything not an Ethernet cable.