Thank you for the link. But they really only discuss the what, not the why. I've included a screen grab of my RF Peformance dashboard. My goal is to figure out what is the root cause of any of ther red.
Likely culprits in my mind are:
The client is not connected to the closest AP
The coverage where the specific client is is poor
It's a crappy client
For the most part I have ruled out too high of a noise floor by looking at the AP stats. (everying is in the high 80s or 90s)
My problem is I don't know how to 'prove' any of these assertions.