At some point in the last week, my daughter's school-issed Dell Chromebook will repeatedly go through a connecting/connected/connecting/connected cycle at our home.  I will watch it go through this cycle a dozen or more times in a row while my iPhone, sitting right next to it, stays connected.

We have 2 EAP225s:  1 downstairs and 1 upstairs, both managed by an OC200 Hardware Controller.  All are running the latest firmware versions.  All are plugged into wired ethernet ports, which are connected to a tp-link PoE switch that itself connects to the carrier's device (whose WiFi is turned off).  

I've read some threads about optimization but they seem to have been written before the latest firmware updates and so the screens are different.

I'm not sure what set of troubleshooting steps I should go through.  The device seems to want to connect to the upstairs WAP when it's downstairs, but its still not so far away that it shouldn't get signal.  We only have a dozen or so devices in the house (~3,000 square feet) using WiFi as most rooms are wired for CAT6.  My daughter's Chromebook doesn't have an ethernet jack though, so I'm out of luck there.  I have seen this same behavior occasionally on one (of 2) Roku devices in the house.