It could be the charger is not finishing the charge because of settings in the charging menu not allowing enough time. (If you have a preset finishing time for charges)
Or your car's clock could be set wrong.
Or charging is getting interrupted due to power glitches from power company.
Jerry, Fresno, California
2017 Bolt ordered, Orange Sunburst, w/all options,
#536 2011 Crystal Red Volt,
2012 Diamond White Volt, saved from the crusher, gift to my niece.
1975 Cosworth Vega, stored
1988 Formula Fiero, also saved from the crusher, in the midst of restoration.