Wifi Disconecting after 2 or 3 days?

[quattrodave]

Morning all,

I have a bit of a strange issue... After 2 or 3 days of my Afterburner being powered on it disconnects from the Wifi for no aparent reason...
The wifi still works from other devices (phone, laptop, tablet etc).  
If I power cycle the router all devices re-connect apart from the Afterburner.  
If I power cycle the Afterburner it re connects to the wifi immediatly and will stay connected for another 2 or 3 days, afterwhich it will disconnect....?!

Has anyone else had this problem, any idea how it may be rectified...??

Thanks