Not sure if you are talking about two papers jammed in different locations or at different times?

first thing would be to clean the tires that pick up the paper, if too smooth then replace. sounds like a timing issue.paper getting stuck halfway in the fuser c(if no other paper jammed) can be Seperation is off causing the paper to rise onto the drum creating a time lapse, paper tansport belt (in the machine after the drum) is not turning ok, or as simple as wrong size paper Letter in machine but says Legal 8 1/2 x 14