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Unifi AP behind an extra switch: 2.4Ghz network stops working after ~30 minutes

I have a very weird issue. I’ve got a relatively simple network setup:

  • router connected to ONT (Fibre)
  • 10 port switch A connected to router, cables to various places in house
  • 4 port switch B connected to switch A, with TV & Xbox connected
  • Unify WiFi AP connected to switch A, both 2.4Ghz and 5Ghz networks

That works well. However, when I connect the WiFi AP to switch B I’m having issues. Initially it all works well, but after ~30 minutes the wifi stops working; I can no longer ping e.g. the router. It only happens to one of the WiFi networks (2.4Ghz or 5Ghz), not both. A reboot of the AP solves it again, but then it stops working after ~30 minutes.

Both switch A and B are 1Ghz switches, zero issues with other devices.

Any idea what I can try?

NeoNachtwaechter ,

I can imagine several causes:

  • more than one DHCP server in your network (most likely)
  • very wrong DNS setup in your network (unlikely, because I guess you would have given us a hint in that direction)
  • heavy downloading traffic and one cheap plastic device (router, switch etc.) runs out of memory
teslasaur ,

Reset the AP to make sure it uses dhcp for its own ip and update firmware from unifi network after adopting the AP again.

Test it by swapping places of the access points to find out if the issue is related to the access points or something else.

jake_jake_jake_ ,

from your router can you ping the AP behind that switch, while the issue is occurring? All L2 unmanaged switches, no tagging? POE from the switch or an injector? If from the switch maybe put an injector in between?

I work for an ISP in the network engineering dept, I personally have never seen an issue exactly like this before, but we generally do power calculations for switching and wifi, this sounds like a power issue to me.

just_another_person ,

Double check the AP doesn’t have a DHCP server enabled. Also, check routes and IP settings when a client first connects to the AP and things work, then again when things stop working.

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