the wiper ARM is loose? Loose at where it connects to the wiper motor?
If the wiper arm is loose: Lift up the plastic cover at the end, this will reveal the nut where the wiper arm attaches through the window. Loosen the nut, make sure the arm is in the proper position, then tighten. (Check the condition of the wiper arm, it may need to be replaced as they do crack)Here is a photo. This may help. Thanks.