It can generally happen that the hub caps loosen. You can easily fix this yourself by hand-tightening the hub with a 5 mm Allen key (insert one into the left side, the other into the right side) in the opposite direction (3-5 Nm).
By the way, this does not necessarily have to be noticeable through wobbling or slight play. We recommend checking and retightening the caps at regular intervals (approx. every 2,000 km) to protect the bearings and keep wear to a minimum.