5Ghz WIFI Dropping out

[#1]

Having problems with 5ghz wifi dropping out every few days and have to reset the router, I've seen a lot of post on this and seems to be a common problem.

my hub firmware is 4.7.5.1.83.8.263has this been fixed yet? is very annoying 

tia marc 

[#2]

Try giving the 5ghz channel a separate SSID name.

[#3]

done that a couple of weeks ago ,also changed channels so I'm currently testing it with Wireless interface type changed to 802.11 a/n (up to 450 Mb/s) 

and see if that makes any difference