MatrixNate

OP, You might also check the Firmware Revision for your Unifi AP's. The new 4.42 firmware is stable for the USG's and Switches, but it's a hot mess for WiFi with LOTS of complaints of slow speeds and/or DHCP latency. If you've already upgraded to 4.42, then I'd start by flashing back to 4.21 as it's stable. The other advice that's been common lately is to go in to the Site configuration on your controller and disable the "Site Optimization". Hope this helps!