"What's so hard about NOT running wires?" - Dilbert. There may be reasons any one of these may be a valid solution, but if you didn't put any thought into DESIGN, it's probably NOT. Not an exhaustive list, and I'll probably add more. http://Bad-Fi.com
  1. All your APs are on the same channel.
    If you don't know what MCA/SCA is don't do this.
  2. All your APs are blasting at full power.
    You need to understand you're environment. CHANNEL REUSE is paramount. It's better when most APs DON'T hear each other. Also, clients too far away for the AP to hear ain't great either.
  3. Your captive portal sucks... because you have a captive portal. 😃
    The ARE reasons, it's just that most of them are bad.
  4. You use channels other than 1, 6, & 11 on your 2.4 GHz WLAN.
    NON OVERLAPPING CHANNELS. Using overlapping channels is worse than being in the same channel. Anything other than 1, 6, or 11 are overlapping.
  5. You only have a 2.4 GHz WLAN.
    It's 2016. 😳
  6. You use WEP for some reason.
    It's 2016. 😳 and it's not secure.
  7. You have TKIP enabled.
    TKIP and 802.11n don't mix. If you want to cripple your WLAN, and ensure none of your clients can achieve high data rates, this will do it.
  8. You don't use DFS in 5 GHz.
    If you're not by an airport, or seaport try it. More channels!
  9. You don't use DFS AND you're running 40 MHz channels.
    Your going to run out of channels quick.
  10. You don't use DFS AND you're running 80 MHz channels.
    You're out of channels. ¯\_(ツ)_/¯
  11. You're running 80 MHz channels.
    Even with DFS enabled probably not a smart move. MAYBE if you have just a few APs. And even then... ¯\_(ツ)_/¯
  12. All your APs are in the hallways for no valid reason.
    There may be valid reasons, but not many, and probably not good ones. Unless you know why and how to do it right, don't. Get your RF as CLOSE to your CLIENTS as possible. Unless everyone hangs out and surfs in the hallway that is.
  13. You have too few APs.
  14. You have too many APs.
  15. You didn't do a design so you have no idea how many APs you need. ★
    How do you know? ¯\_(°_o)_/¯
  16. You're using consumer APs/Routers, and expect enterprise performance.
  17. You're using ARM/ChannelFly/RRM out of the box, with no idea how it works, or why it does what it does.
    This is a something that needs to be understood, and managed, for it to work to your benefit.
  18. You insist on buying/keeping/supporting legacy devices on your WLAN.
    Look, if you're looking to cripple your WLAN, please go ahead and persist.
  19. You buy devices without considering their capabilities, and impact on your WLAN.
    See above.