Epson R2400 not accepting paper
It's usually because the paper feed roller is lightly covered with dust from paper feeding. The rubber coating collects dust over time. The roller tends to work better with glossy and semi-glossy paper but if you feed a lot of photo rag/matte paper you will pick up more residue from the paper.
You can try taking a lightly damp washcloth, hold it against the roller, then hit the top button on the front panel (paper feed) to trigger the roller. With light pressure, hold the damp washcloth against the roller and it should pick up the dust. The roller will revolve twice with every paper feed button push. There is a flat side to the roller that you will notice as it spins around.