Hi, 

I currently have 3 different EAP (670,653, and 655-wall) with a TP-SG2008G switch and ER605. 
 

EAP area mostly set up in a line however having trouble with EAP655-wall with authentication errors. Devices can connect perfectly fine to other devices but when they roam to the 655-wall and right beside the unit, they will fail authentication and eventually be booted back to the 653 or 670. Some devices that are LoT will just suddenly stop working after attempting countlessly to connect the to the 655-wall and then will roam to either the 653 or 670 and attempt later. 
 

This has caused me to fix some of my LoT devices to certain EAP so that it doesn't keep attempting to roam to the 655-Wall which is likely better reception. 
 

wondering if there is any other suggestions you might have?