I looked at Mike's data, and phased it according to the period of SS Leo. The data did not fit that period, so I checked coordinates again and saw the same problem as Mike did. However, looking at the data, there are only two points out of 29 that are fainter that the rest. The scatter is roughly 0.05mag for the remainder of the points, so the two faint measurements are significant based purely on the data presented. Period searches do not find any significant power in periods between 0.5 and 5 days.
More data is required to pin down the period.
Mike's suggestion that it is an eclipsing variable seems good to me.