CAN'T MOVE OBJECTS/SKETCHES IN ILLUSTRATOR

Can somebody help me or knows maybe that problem. Im working with fashion sketches wich regroup many forms/shapes. Suddenly, I can't move the sketches from its place, its like snap to his point. It can only move if i double click and get into his group view, and even sometimes doesnt work. Its really a pain. Usually i was able to move object or group of objects freely wherever i want.. Anyone as the same problem.. Merci@!