  We have measured the low frequency (1mHz<f<10Hz) resistance fluctuations in
metallic nanowires (diameter 15nm to 200nm) in the temperature range 77K to
400K. The nanowires were grown electrochemically in polycarbonate membranes and
the measurements were carried out in arrays of nanowires by retaining them in
the membrane. A large fluctuation in excess of conventional 1/f noise which
peaks beyond a certain temperature was found. The fluctuations with a
significant low frequency component (~1/f^{3/2}) arise when the diameter of the
wire ~15nm and vanishes rapidly as the diameter is increased. We argue that
Rayleigh-Plateau instability is the likely cause of this excess noise.
