This paper analyses technical issues encountered while charging electric vehicles using plug-in chargers. The electric vehicles are charged periodically based on charging system configuration and requirements set by the vehicle. In certain instances, the vehicle charging is interrupted, and the battery does not attain the expected state of charge. If such interruptions occur in commercial vehicles, they can delay the product or service delivery, leading to losses to the fleet owner. The charging process needs to be upgraded to deal with such situations. The charging interruptions are analyzed using logged vehicle measurement data, based on which the software and hardware in the vehicle are updated. The analysis showed that though the coupler was connected to the vehicle, the vehicle could not be charged due to an interruption. Communication error, power supply failure, component protection, component leakage, and charging facilities were identified as the causes of interruptions. This analysis was instrumental in the decision to upgrade the charging system in electric vehicles.