I have a new Pi 3 Model B, with a clean image install of OctoPi 0.15.1 (I only updated the wifi connection info). When I turn on the pi, with only the wifi connection, I can ping/SSH/browse using the bonjour linked octopi.local. However, after about 2 minutes, it stops working. If I reset the wifi connection (either by rebooting the pi or the wifi), the name resolution works again for a couple minutes.
I've tried this from a couple different Windows 10 machines on the same network, all with the Bonjour Print Services for Windows v2.0.2 installed. I've tried redownloading and reflashing the image. Initially after turning on the pi, when I ping octopi.local, I get responses from an IPv6 address. After a couple minutes when I ping octopi.local, I get no responses (only Request timed out) from 188.8.131.52 (I'm assuming this is the bonjour error IP address?).
Everything appears to work fine if I connect via IPv4 address or if I use an Ethernet connection, but both options are rather annoying. Any ideas?