  We present optical photometry of the afterglow of the long GRB 180205A with
the COATLI telescope from 217 seconds to about 5 days after the {\itshape
Swift}/BAT trigger. We analyse this photometry in the conjunction with the
X-ray light curve from {\itshape Swift}/XRT. The late-time light curves and
spectra are consistent with the standard forward-shock scenario. However, the
early-time optical and X-ray light curves show non-typical behavior; the
optical light curve exhibits a flat plateau while the X-ray light curve shows a
flare. We explore several scenarios and conclude that the most likely
explanation for the early behavior is late activity of the central engine.
