i have been battling what I think to be an interference problem for sometime now and can not come up with a way to overcome it or replicate it for testing purposes. The layout is as follows:
about 2 acre sized warehouse building lot of steal and metal trusses in the rafters.
Everything works fine up to about 50 people. Then data speeds and ability to connect to access points degrades very quickly. As soon as people start to leave the network picks up again. I have already tested all other aspects of the network switches router fiber links and everything works fine during this period of high utilization and they check out fine.
There are at least 40 access points in the area not including ones that I have control over. I have tried all brands of access points Mikrotik, Cisco, dlink, netgear, and rockus. Along with all different types of antennas omnis and directionals. I have also tried them in various place in the facility with out any luck.
If anyone has any thoughts or a different access point to try would be great.
This is a common problem when you have so many different Aps. I would suggest a controller based solution. Ruckus Wireless and Aruba seem to work well in a saturated environment.
I also think one of your main issues is probably overloading an AP. An AP functions well with 20-30 users depending on what model it is. If you have a high number of users on one AP that will slow down your network connection because they all have to share the data.
Again a controller based AP solution would help because it will limit the number per ap and move users to another ap that doesnt have as many users.
You can also set a max client count on stand alone APs with most as a quick fix. I would suggest a controller based solution moving forward...
Wireless interference issues 
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