  We report an observation of conductance fuctuations (CFs) in the bipolar
regime of quantum hall (QH) plateaus in graphene (p-n-p/n-p-n) devices. The CFs
in the bipolar regime are shown to decrease with increasing bias and
temperature. At high temperature (above 7 K) the CFs vanishes completely and
the flat quantized plateaus are recovered in the bipolar regime. The values of
QH plateaus are in theoretical agreement based on full equilibration of chiral
channels at the p-n junction. The amplitude of CFs for different filling
factors follows a trend predicted by the random matrix theory. Although, there
are mismatch in the values of CFs between the experiment and theory but at
higher filling factors the experimental values become closer to the theoretical
prediction. The suppression of CFs and its dependence has been understood in
terms of time dependent disorders present at the p-n junctions.
