I have similar problems with the wgr614 router, when the client went out of range it would not re-connect to the wireless connection.
The only way i could reactivate the conneciton was to soft reset the router either by enabling and disabling the wirless connection of somthing else that would reset the router (lights flsh accrossing the front).
Netgear have been no help so far, will bug them again for a fix