Slow Ride, Why wont it stay up!?!?

Having trouble keeping his junk up when I ride him. He likes being lazy and I don't mind that. But when I try to ride him it won't stay up!! Every other position works just fine and foreplay does too. Any suggestions? I've never had this happen, always worked just fine for me before. 😅 He says it's the angle/rhythm/position when I ride, but again, never an issue before!!!