Coworking Wi-Fi drops every afternoon around 3pm
Summary
Connection becomes unusable in the main coworking from ~3pm to 5pm. Calls drop, deploys fail, members leave to cafés.
Why it happens
AP-3 in the south wall is on the same channel as the building's neighbour. When their afternoon shift starts, both routers fight for 5GHz band 36. Confirmed via WiFi Analyzer logs (see documentation).
Solution proposals (1)
Re-channel AP-3 to band 149 + add second AP in south corner
Two-step fix: (1) move AP-3 off the saturated 36 band onto 149, which the neighbour isn't on. (2) Mount a second Unifi U6-Pro on the south column to handle the afternoon load. Estimated parts: $189.
Documentation. What shipped.
Fixer: u_marcus
Logged channel utilisation across a week. Band 36 hit 92% saturation between 14:50 and 17:10 every weekday. Switched AP-3 to band 149, added a Unifi U6-Pro mounted on the south column. Latency p95 went from 480ms to 38ms during the problem window. Total parts: $189. $51 returned to bounty pool for next infra fix.