Sofa cushions will lose their shape and fluff in time. That is not all, though. Cushions sliding from the sofa is another issue. Depending on the cushion upholstery, your sofa cushions may start sliding even after a month of purchase. It may be that the upholstery is not rough enough to keep the cushions in place.
When this happens, you need to push the cushions back repeatedly so you can sit comfortably and to keep your modern sofa from looking disordered. Stop your cushions from sliding and making you upset with the following solutions.