A resistivity anomaly near the superconducting transition temperature is observed in the ab-plane of as-grown Bi 2 Sr 2 CaCu 2 O 8 (Bi-2212) single crystals. The resistivity at the peak is much larger than the normal state resistivity around 100 K. The peak vanished gradually with increasing the applied magnetic field. I-V curves of the Bi-2212 samples also exhibit a peak close to the transition steps, vanishing gradually with increasing intrinsic granularity of high-T c superconductors.