The problem only arisen 2 nights ago when I was trying to browse the web and the wifi just randomly disconnected and turned off, then I tried to enable it again and it went downhill from there. As stated I only updated to the MGA firmware when the phone popped up with the update a few days ago. Prior to this the phone's wifi always worked fine.
I'm currently back to stock now and I know for sure that this must be more than a firmware issue as I'm experiencing the same issue when running on the older MEA firmware too, not only that but the phone is also randomly rebooting itself when tasks are running in the background which to me is not a good sign at all even when running on stock. The phone itself is only just under a month old, I purchased from a reseller brand new via from that Rainforest website but no doubt I will have to go to Samsung directly to get it sorted out.
Liam