I have a win 7 64 bit dell laptop. It has been using 2 different antennas with realtek 8187 adapters in them flawlessly for 4 months.. Now They only work first thing in morning for an hour... I have reinstalled os to factory, new drivers as recommended by radio labs. Etc etc,, They are usb antennas and same thing on all usb ports.. The computer runs a Belkin external flawlessly but for some reason these realteks don't like me any more... The computers internal wireless is perfect . No flaws in device manager or anything... Any suggestions? Several guru's have tried for several hours but to no avail.. Hardware diagnostics show everything good too.