R700 disconnects with surfaces/dell laptops nonstop

[jodee_6910933]

We have an R700 with firmware 9.8.3.0.14.  They are using this as a standalone.

I tried firmware 100.x and nobody could even get to the internet with this firmware so I reverted back.

It was on channelfly I turned that off.  

I turned off 5ghz. 

The client keeps telling me their wifi is crap and they get kicked out of their sage program and internet nonstop through the day.  

Anyone have this issue with r700 and/or any other settings I can try?