Wireless access Local Only

I've a VAIO laptop running Vista Home Premium with a DLINK router. I've
searched threads here and elsewhere and found similar problems but no
definitive solution for my problem. The problem is I get seemingly random
occurrences of Local Only access. I say seemingly random but it seems to
occur after exiting sleep mode, after switching user or when going from
battery power to mains power but not every time. The signal strength remains
at normal strength hence no loss of siganl. The cure is sometimes to disable
and re-enable the PCs wireless adapter, sometimes re-boot the computer and
sometimes I have to power off the router. KIM (MS) replied to a similar
problem in March and said it was being worked on but the thread ended
soonafter. Any help would be appreciated. Thanks.