Loss of Wi-Fi connection

Feb 20, 2013
I currently use 3.3.1 and am finding that Wi-Fi after a while is not connecting or more accurately, losses connection and the only fix I've found is to reboot.
My home Wi-Fi is a hidden access point and whilst Wi-Fi manager app (from market) is showing the access point as present and available the phone won't connect.
Anyone else had this or know of a fix please?