How many access points are we talking about here? How many SSID's? For stability it's best to have the SSID dedicated to either 2.4 or 5GHz. Don't use band steering etc. I would also recommend static power/channels. Sounds like you did a survey, so those results would help you decide what power level you should have the radio's operating at. Data rates on 2.4 choose either 12 or 24. 5GHz either 6/12/24. If you have a crap ton of access points then I would lean towards 24. However using 6Mbps might possibly help with retries etc. Those three rates are mandatory per the 802.11-2012 (Section 18.2.2.3) standard. So some old devices (rare though) might act up if you use something like 18Mbps etc. I would also do a sanity check on every single port that each AP is connected to. Make sure they are setup correctly, native vlans/allowed vlans etc. Make sure your SSID configs are correct on that aspect as well if your using bridge-mode. If you CAN get everything on 5GHz it's usually preferred, and if a proper survey was completed, this shouldn't be an issue. With the static channels make sure you only use frequencies that your devices support. Those devices might only be able to use UNII1/3 for example, so DFS might not be an option. If you have an access point in the break rooms/office areas for example, and production clients never really connect to it (warehouse ones that is), you could put those ones on UNII2 band so that any traffic on that AP isn't having any impact on the wireless out in the warehouse with people watching YouTube etc. Just make it vanish like magic 😃 Check the client devices wireless settings. if there are options to force it to only use 5ghz, then that might be the direction you want to go. look at driver version updates etc. As long as your configuration is solid (sounds like it could use some tweaking), and a proper survey was done, then your at the will of the client gods lol.
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