Jkay

I have a Ryobi RY48111 (RM480EX) riding mower that keeps stopping under small loads. Even with some grass clippings that I tried to run over to get it to mulch, the motor would stop under load. It’s driving me nuts! I thought it was from not sharpening the blades but it still stops under load when the blades are sharpened. Anyone have any idea why this is happening? Maybe I’m cutting the grass too low?