  We present results of conductance-noise experiments on disordered films of
crystalline indium oxide with lateral dimensions 2microns to 1mm. The
power-spectrum of the noise has the usual 1/f form, and its magnitude increases
with inverse sample-volume down to sample size of 2microns, a behavior
consistent with un-correlated fluctuators. A colored second spectrum is only
occasionally encountered (in samples smaller than 40microns), and the lack of
systematic dependence of non-Gaussianity on sample parameters persisted down to
the smallest samples studied (2microns). Moreover, it turns out that the degree
of non-Gaussianity exhibits a non-trivial dependence on the bias V used in the
measurements; it initially increases with V then, when the bias is deeper into
the non-linear transport regime it decreases with V. We describe a model that
reproduces the main observed features and argue that such a behavior arises
from a non-linear effect inherent to electronic transport in a hopping system
and should be observed whether or not the system is glassy.
