Thanks, tried first one, works like a charm.

AC Lite. It doesn’t need controller, it’s standalone. I configure it via the mobile app.

It’s a standalone AP. No controller. Two different SSIDs.

I’ve had it running now for 2 hours and of course now it works. The only change since last time is that I’ve reset the AP and did a firmware upgrade. Perhaps that fixed it…

There’s only a single DHCP server, a Pihole, which also serves as DNS. Switch B is a cheaper switch, so that may be the culprit. I use it for heavy downloading from my Xbox and that is never a big issue. Speeds fluctuate from 100 to 900mbps (my max) but that’s not necessarily a switch problem.

Yep, thanks for checking, there’s only 1 DHCP server on my network. I’ve just moved it back to behind switch B and will do more investigation when the problem occurs again.

I’ve just moved it back to behind switch B, will do testing as you suggest.

The switch doesn’t have POE, the Unifi AP does use POE via its own POE injector.

Thanks. I’ve recently reset it, it has its own IP via DHCP. I’ve just moved it back to behind switch B, will do testing as you suggest.

Home Assistant. It’s a rabbit hole, but it’s great. I’ve got motion enabled lights, thermostats for “dumb” heaters, and I track device usage (tablet, xbox) of my kids.