Hi everyone, 

I have seen quite a few posts talking about issues with this AP but none recently. I am considering returning it and going with the 670V2 if it wil not be stable. However, I am open to other suggestions/equipment. Please see my current situation below. 

hardware:

ER605 V2

SG2008P

EAP683UR

software controller running on Linux Ubuntu 24/7. 
ISP Fiber connection speeds of 950mbps down and 660 upload. 

3 current VLANs 

3 matching WLANs each band separated out

little to no neighbor interference on most channels 

house is a ranch style with finished basement around 1780sq ft. 
AP placement is in the middle of the house ceiling mounted on main floor away from obstructions. 

I recently purchased the EAP683 UR and have had quite a rough time with performance on it. When I first adopted it I was receiving speeds around 200mbps down and 300mbps upload standing less than 5 foot from it. When I setup my VLANs the speeds got even worse. All hardware was updated to the latest firmware during this trial period. I have also noticed significant errors, drops, and retries. Please see the attached pictures. 

troubleshooting I tried:

/reducing TX power on both 2.4 and 5ghz - no affect

/seperating each band- no affect 

/changing channels and width- little to no affect, even performance loss on certain bands

/ rebooting systems- no affect 

the only thing has seemed to make any difference was updating to the most current beta release (which meant updating to the most recent beta release software controller). Although even still the pictures are after all that and I am still having high errors and degraded performance especially if I move more than 10 feet away from the AP. 

please let me know if I should submit this elsewhere.